Whether the intellectual soul knows itself by its essence?

Objection 1. It would seem that the intellectual soul knows itself by its own essence. For Augustine says (De Trin. ix, 3), that "the mind knows itself, because it is incorporeal."

Objection 2. Further, both angels and human souls belong to the genus of intellectual substance. But an angel understands itself by its own essence. Therefore likewise does the human soul.

Objection 3. Further, "in things void of matter, the intellect and that which is understood are the same" (De Anima iii, 4). But the human mind is void of matter, not being the act of a body as stated above (I:76:1). Therefore the intellect and its object are the same in the human mind; and therefore the human mind understands itself by its own essence.

On the contrary, It is said (De Anima iii, 4) that "the intellect understands itself in the same way as it understands other things." But it understands other things, not by their essence, but by their similitudes. Therefore it does not understand itself by its own essence.

I answer that, Everything is knowable so far as it is in act, and not, so far as it is in potentiality (Metaph. ix, Did. viii, 9): for a thing is a being, and is true, and therefore knowable, according as it is actual. This is quite clear as regards sensible things, for the eye does not see what is potentially, but what is actually colored. In like manner it is clear that the intellect, so far as it knows material things, does not know save what is in act: and hence it does not know primary matter except as proportionate to form, as is stated Phys. i, 7. Consequently immaterial substances are intelligible by their own essence according as each one is actual by its own essence.

Therefore it is that the Essence of God, the pure and perfect act, is simply and perfectly in itself intelligible; and hence God by His own Essence knows Himself, and all other things also. The angelic essence belongs, indeed, to the genus of intelligible things as "act," but not as a "pure act," nor as a "complete act," and hence the angel's act of intelligence is not completed by his essence. For although an angel understands himself by his own essence, still he cannot understand all other things by his own essence; for he knows things other than himself by their likenesses. Now the human intellect is only a potentiality in the genus of intelligible beings, just as primary matter is a potentiality as regards sensible beings; and hence it is called "possible" [Possibilis—elsewhere in this translation rendered "passive"—Ed.]. Therefore in its essence the human mind is potentially understanding. Hence it has in itself the power to understand, but not to be understood, except as it is made actual. For even the Platonists asserted than an order of intelligible beings existed above the order of intellects, forasmuch as the intellect understands only by participation of the intelligible; for they said that the participator is below what it participates. If, therefore, the human intellect, as the Platonists held, became actual by participating separate intelligible forms, it would understand itself by such participation of incorporeal beings. But as in this life our intellect has material and sensible things for its proper natural object, as stated above (I:84:7), it understands itself according as it is made actual by the species abstracted from sensible things, through the light of the active intellect, which not only actuates the intelligible things themselves, but also, by their instrumentality, actuates the passive intellect. Therefore the intellect knows itself not by its essence, but by its act. This happens in two ways: In the first place, singularly, as when Socrates or Plato perceives that he has an intellectual soul because he perceives that he understands. In the second place, universally, as when we consider the nature of the human mind from knowledge of the intellectual act. It is true, however, that the judgment and force of this knowledge, whereby we know the nature of the soul, comes to us according to the derivation of our intellectual light from the Divine Truth which contains the types of all things as above stated (I:84:5. Hence Augustine says (De Trin. ix, 6): "We gaze on the inviolable truth whence we can as perfectly as possible define, not what each man's mind is, but what it ought to be in the light of the eternal types." There is, however, a difference between these two kinds of knowledge, and it consists in this, that the mere presence of the mind suffices for the first; the mind itself being the principle of action whereby it perceives itself, and hence it is said to know itself by its own presence. But as regards the second kind of knowledge, the mere presence of the mind does not suffice, and there is further required a careful and subtle inquiry. Hence many are ignorant of the soul's nature, and many have erred about it. So Augustine says (De Trin. x, 9), concerning such mental inquiry: "Let the mind strive not to see itself as if it were absent, but to discern itself as present"—i.e. to know how it differs from other things; which is to know its essence and nature.

Reply to Objection 1. The mind knows itself by means of itself, because at length it acquires knowledge of itself, though led thereto by its own act: because it is itself that it knows since it loves itself, as he says in the same passage. For a thing can be called self-evident in two ways, either because we can know it by nothing else except itself, as first principles are called self-evident; or because it is not accidentally knowable, as color is visible of itself, whereas substance is visible by its accident.

Reply to Objection 2. The essence of an angel is an act in the genus of intelligible things, and therefore it is both intellect and the thing understood. Hence an angel apprehends his own essence through itself: not so the human mind, which is either altogether in potentiality to intelligible things—as is the passive intellect—or is the act of intelligible things abstracted from the phantasms—as is the active intellect.

Reply to Objection 3. This saying of the Philosopher is universally true in every kind of intellect. For as sense in act is the sensible in act, by reason of the sensible likeness which is the form of sense in act, so likewise the intellect in act is the object understood in act, by reason of the likeness of the thing understood, which is the form of the intellect in act. So the human intellect, which becomes actual by the species of the object understood, is itself understood by the same species as by its own form. Now to say that in "things without matter the intellect and what is understood are the same," is equal to saying that "as regards things actually understood the intellect and what is understood are the same." For a thing is actually understood in that it is immaterial. But a distinction must be drawn: since the essences of some things are immaterial—as the separate substances called angels, each of which is understood and understands, whereas there are other things whose essences are not wholly immaterial, but only the abstract likenesses thereof. Hence the Commentator says (De Anima iii) that the proposition quoted is true only of separate substances; because in a sense it is verified in their regard, and not in regard of other substances, as already stated (Reply to Objection 2).


Whether our intellect knows the habits of the soul by their essence?

Objection 1. It would seem that our intellect knows the habits of the soul by their essence. For Augustine says (De Trin. xiii, 1): "Faith is not seen in the heart wherein it abides, as the soul of a man may be seen by another from the movement of the body; but we know most certainly that it is there, and conscience proclaims its existence"; and the same principle applies to the other habits of the soul. Therefore the habits of the soul are not known by their acts, but by themselves.

Objection 2. Further, material things outside the soul are known by their likeness being present in the soul, and are said therefore to be known by their likenesses. But the soul's habits are present by their essence in the soul. Therefore the habits of the soul are known by their essence.

Objection 3. Further, "whatever is the cause of a thing being such is still more so." But habits and intelligible species cause things to be known by the soul. Therefore they are still more known by the soul in themselves.

On the contrary, Habits like powers are the principles of acts. But as is said (De Anima ii, 4), "acts and operations are logically prior to powers." Therefore in the same way they are prior to habits; and thus habits, like the powers, are known by their acts.

I answer that, A habit is a kind of medium between mere power and mere act. Now, it has been said (Article 1) that nothing is known but as it is actual: therefore so far as a habit fails in being a perfect act, it falls short in being of itself knowable, and can be known only by its act; thus, for example, anyone knows he has a habit from the fact that he can produce the act proper to that habit; or he may inquire into the nature and idea of the habit by considering the act. The first kind of knowledge of the habit arises from its being present, for the very fact of its presence causes the act whereby it is known. The second kind of knowledge of the habit arises from a careful inquiry, as is explained above of the mind (Article 1).

Reply to Objection 1. Although faith is not known by external movement of the body, it is perceived by the subject wherein it resides, by the interior act of the heart. For no one knows that he has faith unless he knows that he believes.

Reply to Objection 2. Habits are present in our intellect, not as its object since, in the present state of life, our intellect's object is the nature of a material thing as stated above (I:84:7), but as that by which it understands.

Reply to Objection 3. The axiom, "whatever is the cause of a thing being such, is still more so," is true of things that are of the same order, for instance, of the same kind of cause; for example, we may say that health is desirable on account of life, and therefore life is more desirable still. But if we take things of different orders the axiom is not true: for we may say that health is caused by medicine, but it does not follow that medicine is more desirable than health, for health belongs to the order of final causes, whereas medicine belongs to the order of efficient causes. So of two things belonging essentially to the order of the objects of knowledge, the one which is the cause of the other being known, is the more known, as principles are more known than conclusions. But habit as such does not belong to the order of objects of knowledge; nor are things known on account of the habit, as on account of an object known, but as on account of a disposition or form whereby the subject knows: and therefore the argument does not prove.


Whether our intellect knows its own act?

Objection 1. It would seem that our intellect does not know its own act. For what is known is the object of the knowing faculty. But the act differs from the object. Therefore the intellect does not know its own act.

Objection 2. Further, whatever is known is known by some act. If, then, the intellect knows its own act, it knows it by some act, and again it knows that act by some other act; this is to proceed indefinitely, which seems impossible.

Objection 3. Further, the intellect has the same relation to its act as sense has to its act. But the proper sense does not feel its own act, for this belongs to the common sense, as stated De Anima iii, 2. Therefore neither does the intellect understand its own act.

On the contrary, Augustine says (De Trin. x, 11), "I understand that I understand."

I answer that, As stated above (Articles 1 and 2) a thing is intelligible according as it is in act. Now the ultimate perfection of the intellect consists in its own operation: for this is not an act tending to something else in which lies the perfection of the work accomplished, as building is the perfection of the thing built; but it remains in the agent as its perfection and act, as is said Metaph. ix, Did. viii, 8. Therefore the first thing understood of the intellect is its own act of understanding. This occurs in different ways with different intellects. For there is an intellect, namely, the Divine, which is Its own act of intelligence, so that in God the understanding of His intelligence, and the understanding of His Essence, are one and the same act, because His Essence is His act of understanding. But there is another intellect, the angelic, which is not its own act of understanding, as we have said above (I:79:1), and yet the first object of that act is the angelic essence. Wherefore although there is a logical distinction between the act whereby he understands that he understands, and that whereby he understands his essence, yet he understands both by one and the same act; because to understand his own essence is the proper perfection of his essence, and by one and the same act is a thing, together with its perfection, understood. And there is yet another, namely, the human intellect, which neither is its own act of understanding, nor is its own essence the first object of its act of understanding, for this object is the nature of a material thing. And therefore that which is first known by the human intellect is an object of this kind, and that which is known secondarily is the act by which that object is known; and through the act the intellect itself is known, the perfection of which is this act of understanding. For this reason did the Philosopher assert that objects are known before acts, and acts before powers (De Anima ii, 4).

Reply to Objection 1. The object of the intellect is something universal, namely, "being" and "the true," in which the act also of understanding is comprised. Wherefore the intellect can understand its own act. But not primarily, since the first object of our intellect, in this state of life, is not every being and everything true, but "being" and "true," as considered in material things, as we have said above (I:84:7), from which it acquires knowledge of all other things.

Reply to Objection 2. The intelligent act of the human intellect is not the act and perfection of the material nature understood, as if the nature of the material thing and intelligent act could be understood by one act; just as a thing and its perfection are understood by one act. Hence the act whereby the intellect understands a stone is distinct from the act whereby it understands that it understands a stone; and so on. Nor is there any difficulty in the intellect being thus potentially infinite, as explained above (I:86:2).

Reply to Objection 3. The proper sense feels by reason of the immutation in the material organ caused by the external sensible. A material object, however, cannot immute itself; but one is immuted by another, and therefore the act of the proper sense is perceived by the common sense. The intellect, on the contrary, does not perform the act of understanding by the material immutation of an organ; and so there is no comparison.


Whether the intellect understands the act of the will?

Objection 1. It would seem that the intellect does not understand the act of the will. For nothing is known by the intellect, unless it be in some way present in the intellect. But the act of the will is not in the intellect; since the will and the intellect are distinct. Therefore the act of the will is not known by the intellect.

Objection 2. Further, the act is specified by the object. But the object of the will is not the same as the object of the intellect. Therefore the act of the will is specifically distinct from the object of the intellect, and therefore the act of the will is not known by the intellect.

Objection 3. Augustine (Confess. x, 17) says of the soul's affections that "they are known neither by images as bodies are known; nor by their presence, like the arts; but by certain notions." Now it does not seem that there can be in the soul any other notions of things but either the essences of things known or the likenesses thereof. Therefore it seems impossible for the intellect to known such affections of the soul as the acts of the will.

On the contrary, Augustine says (De Trin. x, 11), "I understand that I will."

I answer that, As stated above (I:59:1), the act of the will is nothing but an inclination consequent on the form understood; just as the natural appetite is an inclination consequent on the natural form. Now the inclination of a thing resides in it according to its mode of existence; and hence the natural inclination resides in a natural thing naturally, and the inclination called the sensible appetite is in the sensible thing sensibly; and likewise the intelligible inclination, which is the act of the will, is in the intelligent subject intelligibly as in its principle and proper subject. Hence the Philosopher expresses himself thus (De Anima iii, 9)—that "the will is in the reason." Now whatever is intelligibly in an intelligent subject, is understood by that subject. Therefore the act of the will is understood by the intellect, both inasmuch as one knows that one wills; and inasmuch as one knows the nature of this act, and consequently, the nature of its principle which is the habit or power.

Reply to Objection 1. This argument would hold good if the will and the intellect were in different subjects, as they are distinct powers; for then whatever was in the will would not be in the intellect. But as both are rooted in the same substance of the soul, and since one is in a certain way the principle of the other, consequently what is in the will is, in a certain way, also in the intellect.

Reply to Objection 2. The "good" and the "true" which are the objects of the will and of the intellect, differ logically, but one is contained in the other, as we have said above (I:82:4 ad 1; I:16:4 ad 1); for the true is good and the good is true. Therefore the objects of the will fall under the intellect, and those of the intellect can fall under the will.

Reply to Objection 3. The affections of the soul are in the intellect not by similitude only, like bodies; nor by being present in their subject, as the arts; but as the thing caused is in its principle, which contains some notion of the thing caused. And so Augustine says that the soul's affections are in the memory by certain notions.

The Summa Theologiæ of St. Thomas AquinasSecond and Revised Edition, 1920Literally translated by Fathers of the English Dominican ProvinceOnline Edition Copyright © 2017 by Kevin Knight Nihil Obstat. F. Innocentius Apap, O.P., S.T.M., Censor. Theol.Imprimatur. Edus. Canonicus Surmont, Vicarius Generalis. Westmonasterii.APPROBATIO ORDINISNihil Obstat. F. Raphael Moss, O.P., S.T.L. and F. Leo Moore, O.P., S.T.L.Imprimatur. F. Beda Jarrett, O.P., S.T.L., A.M., Prior Provincialis AngliæMARIÆ IMMACULATÆ - SEDI SAPIENTIÆ

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Whether the human soul in the present state of life can understand immaterial substances in themselves?

Objection 1. It would seem that the human soul in the present state of life can understand immaterial substances in themselves. For Augustine (De Trin. ix, 3) says: "As the mind itself acquires the knowledge of corporeal things by means of the corporeal senses, so it gains from itself the knowledge of incorporeal things." But these are the immaterial substances. Therefore the human mind understands immaterial substances.

Objection 2. Further, like is known by like. But the human mind is more akin to immaterial than to material things; since its own nature is immaterial, as is clear from what we have said above (I:76:1). Since then our mind understands material things, much more is it able to understand immaterial things.

Objection 3. Further, the fact that objects which are in themselves most sensible are not most felt by us, comes from sense being corrupted by their very excellence. But the intellect is not subject to such a corrupting influence from its object, as is stated De Anima iii, 4. Therefore things which are in themselves in the highest degree of intelligibility, are likewise to us most intelligible. As material things, however, are intelligible only so far as we make them actually so by abstracting them from material conditions, it is clear that those substances are more intelligible in themselves whose nature is immaterial. Therefore they are much more known to us than are material things.

Objection 4. Further, the Commentator says (Metaph. ii) that "nature would be frustrated in its end" were we unable to understand abstract substances, "because it would have made what in itself is naturally intelligible not to be understood at all." But in nature nothing is idle or purposeless. Therefore immaterial substances can be understood by us.

Objection 5. Further, as sense is to the sensible, so is intellect to the intelligible. But our sight can see all things corporeal, whether superior and incorruptible; or lower and corruptible. Therefore our intellect can understand all intelligible substances, even the superior and immaterial.

On the contrary, It is written (Wisdom 9:16): "The things that are in heaven, who shall search out?" But these substances are said to be in heaven, according to Matthew 18:10, "Their angels in heaven," etc. Therefore immaterial substances cannot be known by human investigation.

I answer that, In the opinion of Plato, immaterial substances are not only understood by us, but are the objects we understand first of all. For Plato taught that immaterial subsisting forms, which he called "Ideas," are the proper objects of our intellect, and thus first and per se understood by us; and, further, that material objects are known by the soul inasmuch as phantasy and sense are mixed up with the mind. Hence the purer the intellect is, so much the more clearly does it perceive the intelligible truth of immaterial things.

But in Aristotle's opinion, which experience corroborates, our intellect in its present state of life has a natural relationship to the natures of material things; and therefore it can only understand by turning to the phantasms, as we have said above (I:84:7). Thus it clearly appears that immaterial substances which do not fall under sense and imagination, cannot first and per se be known by us, according to the mode of knowledge which experience proves us to have.

Nevertheless Averroes (Comment. De Anima iii) teaches that in this present life man can in the end arrive at the knowledge of separate substances by being coupled or united to some separate substance, which he calls the "active intellect," and which, being a separate substance itself, can naturally understand separate substances. Hence, when it is perfectly united to us so that by its means we are able to understand perfectly, we also shall be able to understand separate substances, as in the present life through the medium of the passive intellect united to us, we can understand material things. Now he said that the active intellect is united to us, thus. For since we understand by means of both the active intellect and intelligible objects, as, for instance, we understand conclusions by principles understood; it is clear that the active intellect must be compared to the objects understood, either as the principal agent is to the instrument, or as form to matter. For an action is ascribed to two principles in one of these two ways; to a principal agent and to an instrument, as cutting to the workman and the saw; to a form and its subject, as heating to heat and fire. In both these ways the active intellect can be compared to the intelligible object as perfection is to the perfectible, and as act is to potentiality. Now a subject is made perfect and receives its perfection at one and the same time, as the reception of what is actually visible synchronizes with the reception of light in the eye. Therefore the passive intellect receives the intelligible object and the active intellect together; and the more numerous the intelligible objects received, so much the nearer do we come to the point of perfect union between ourselves and the active intellect; so much so that when we understand all the intelligible objects, the active intellect becomes one with us, and by its instrumentality we can understand all things material and immaterial. In this he makes the ultimate happiness of man to consist. Nor, as regards the present inquiry, does it matter whether the passive intellect in that state of happiness understands separate substances by the instrumentality of the active intellect, as he himself maintains, or whether (as he says Alexander holds) the passive intellect can never understand separate substances (because according to him it is corruptible), but man understands separate substances by means of the active intellect.

This opinion, however, is untrue.

First, because, supposing the active intellect to be a separate substance, we could not formally understand by its instrumentality, for the medium of an agent's formal action consists in its form and act, since every agent acts according to its actuality, as was said of the passive intellect (I:70:1.

Secondly, this opinion is untrue, because in the above explanation, the active intellect, supposing it to be a separate substance, would not be joined to us in its substance, but only in its light, as participated in things understood; and would not extend to the other acts of the active intellect so as to enable us to understand immaterial substances; just as when we see colors set off by the sun, we are not united to the substance of the sun so as to act like the sun, but its light only is united to us, that we may see the colors.

Thirdly, this opinion is untrue, because granted that, as above explained, the active intellect were united to us in substance, still it is not said that it is wholly so united in regard to one intelligible object, or two; but rather in regard to all intelligible objects. But all such objects together do not equal the force of the active intellect, as it is a much greater thing to understand separate substances than to understand all material things. Hence it clearly follows that the knowledge of all material things would not make the active intellect to be so united to us as to enable us by its instrumentality to understand separate substances.

Fourthly, this opinion is untrue, because it is hardly possible for anyone in this world to understand all material things: and thus no one, or very few, could reach to perfect felicity; which is against what the Philosopher says (Ethic. i, 9), that happiness is a "kind of common good, communicable to all capable of virtue." Further, it is unreasonable that only the few of any species attain to the end of the species.

Fifthly, the Philosopher expressly says (Ethic. i, 10), that happiness is "an operation according to perfect virtue"; and after enumerating many virtues in the tenth book, he concludes (Ethic. i, 7) that ultimate happiness consisting in the knowledge of the highest things intelligible is attained through the virtue of wisdom, which in the sixth chapter he had named as the chief of speculative sciences. Hence Aristotle clearly places the ultimate felicity of man in the knowledge of separate substances, obtainable by speculative science; and not by being united to the active intellect as some imagined.

Sixthly, as was shown above (I:79:4), the active intellect is not a separate substance; but a faculty of the soul, extending itself actively to the same objects to which the passive intellect extends receptively; because, as is stated (De Anima iii, 5), the passive intellect is "all things potentially," and the active intellect is "all things in act." Therefore both intellects, according to the present state of life, extend to material things only, which are made actually intelligible by the active intellect, and are received in the passive intellect. Hence in the present state of life we cannot understand separate immaterial substances in themselves, either by the passive or by the active intellect.

Reply to Objection 1. Augustine may be taken to mean that the knowledge of incorporeal things in the mind can be gained by the mind itself. This is so true that philosophers also say that the knowledge concerning the soul is a principle for the knowledge of separate substances. For by knowing itself, it attains to some knowledge of incorporeal substances, such as is within its compass; not that the knowledge of itself gives it a perfect and absolute knowledge of them.

Reply to Objection 2. The likeness of nature is not a sufficient cause of knowledge; otherwise what Empedocles said would be true —that the soul needs to have the nature of all in order to know all. But knowledge requires that the likeness of the thing known be in the knower, as a kind of form thereof. Now our passive intellect, in the present state of life, is such that it can be informed with similitudes abstracted from phantasms: and therefore it knows material things rather than immaterial substances.

Reply to Objection 3. There must needs be some proportion between the object and the faculty of knowledge; such as of the active to the passive, and of perfection to the perfectible. Hence that sensible objects of great power are not grasped by the senses, is due not merely to the fact that they corrupt the organ, but also to their being improportionate to the sensitive power. And thus it is that immaterial substances are improportionate to our intellect, in our present state of life, so that it cannot understand them.

Reply to Objection 4. This argument of the Commentator fails in several ways.

First, because if separate substances are not understood by us, it does not follow that they are not understood by any intellect; for they are understood by themselves, and by one another.

Secondly, to be understood by us is not the end of separate substances: while only that is vain and purposeless, which fails to attain its end. It does not follow, therefore, that immaterial substances are purposeless, even if they are not understood by us at all.

Reply to Objection 5. Sense knows bodies, whether superior or inferior, in the same way, that is, by the sensible acting on the organ. But we do not understand material and immaterial substances in the same way. The former we understand by a process of abstraction, which is impossible in the case of the latter, for there are no phantasms of what is immaterial.


Whether our intellect can understand immaterial substances through its knowledge of material things?

Objection 1. It would seem that our intellect can know immaterial substances through the knowledge of material things. For Dionysius says (Coel. Hier. i) that "the human mind cannot be raised up to immaterial contemplation of the heavenly hierarchies, unless it is led thereto by material guidance according to its own nature." Therefore we can be led by material things to know immaterial substances.

Objection 2. Further, science resides in the intellect. But there are sciences and definitions of immaterial substances; for Damascene defines an angel (De Fide Orth. ii, 3); and we find angels treated of both in theology and philosophy. Therefore immaterial substances can be understood by us.

Objection 3. Further, the human soul belongs to the genus of immaterial substances. But it can be understood by us through its act by which it understands material things. Therefore also other material substances can be understood by us, through their material effects.

Objection 4. Further, the only cause which cannot be comprehended through its effects is that which is infinitely distant from them, and this belongs to God alone. Therefore other created immaterial substances can be understood by us through material things.

On the contrary, Dionysius says (Div. Nom. i) that "intelligible things cannot be understood through sensible things, nor composite things through simple, nor incorporeal through corporeal."

I answer that, Averroes says (De Anima iii) that a philosopher named Avempace [Ibn-Badja, Arabian Philosopher; ob. 1183] taught that by the understanding of natural substances we can be led, according to true philosophical principles, to the knowledge of immaterial substances. For since the nature of our intellect is to abstract the quiddity of material things from matter, anything material residing in that abstracted quiddity can again be made subject to abstraction; and as the process of abstraction cannot go on forever, it must arrive at length at some immaterial quiddity, absolutely without matter; and this would be the understanding of immaterial substance.

Now this opinion would be true, were immaterial substances the forms and species of these material things; as the Platonists supposed. But supposing, on the contrary, that immaterial substances differ altogether from the quiddity of material things, it follows that however much our intellect abstract the quiddity of material things from matter, it could never arrive at anything akin to immaterial substance. Therefore we are not able perfectly to understand immaterial substances through material substances.

Reply to Objection 1. From material things we can rise to some kind of knowledge of immaterial things, but not to the perfect knowledge thereof; for there is no proper and adequate proportion between material and immaterial things, and the likenesses drawn from material things for the understanding of immaterial things are very dissimilar therefrom, as Dionysius says (Coel. Hier. ii).

Reply to Objection 2. Science treats of higher things principally by way of negation. Thus Aristotle (De Coel. i, 3) explains the heavenly bodies by denying to them inferior corporeal properties. Hence it follows that much less can immaterial substances be known by us in such a way as to make us know their quiddity; but we may have a scientific knowledge of them by way of negation and by their relation to material things.

Reply to Objection 3. The human soul understands itself through its own act of understanding, which is proper to it, showing perfectly its power and nature. But the power and nature of immaterial substances cannot be perfectly known through such act, nor through any other material thing, because there is no proportion between the latter and the power of the former.

Reply to Objection 4. Created immaterial substances are not in the same natural genus as material substances, for they do not agree in power or in matter; but they belong to the same logical genus, because even immaterial substances are in the predicament of substance, as their essence is distinct from their existence. But God has no connection with material things, as regards either natural genus or logical genus; because God is in no genus, as stated above (I:3:5). Hence through the likeness derived from material things we can know something positive concerning the angels, according to some common notion, though not according to the specific nature; whereas we cannot acquire any such knowledge at all about God.


Whether God is the first object known by the human mind?

Objection 1. It would seem that God is the first object known by the human mind. For that object in which all others are known, and by which we judge others, is the first thing known to us; as light is to the eye, and first principles to the intellect. But we know all things in the light of the first truth, and thereby judge of all things, as Augustine says (De Trin. xii, 2; De Vera Relig. xxxi; Confess. xii, 25). Therefore God is the first object known to us.

Objection 2. Further, whatever causes a thing to be such is more so. But God is the cause of all our knowledge; for He is "the true light which enlighteneth every man that cometh into this world" (John 1:9). Therefore God is our first and most known object.

Objection 3. Further, what is first known in the image is the exemplar to which it is made. But in our mind is the image of God, as Augustine says (De Trin. xii, 4,7). Therefore God is the first object known to our mind.

On the contrary, "No man hath seen God at any time" (John 1:18).

I answer that, Since the human intellect in the present state of life cannot understand even immaterial created substances (Article 1), much less can it understand the essence of the uncreated substance. Hence it must be said simply that God is not the first object of our knowledge. Rather do we know God through creatures, according to the Apostle (Romans 1:20), "the invisible things of God are clearly seen, being understood by the things that are made": while the first object of our knowledge in this life is the "quiddity of a material thing," which is the proper object of our intellect, as appears above in many passages (I:84:7; I:85:8; I:87:2 ad 2)

Reply to Objection 1. We see and judge of all things in the light of the first truth, forasmuch as the light itself of our mind, whether natural or gratuitous, is nothing else than the impression of the first truth upon it, as stated above (I:12:2). Hence, as the light itself of our intellect is not the object it understands, much less can it be said that God is the first object known by our intellect.

Reply to Objection 2. The axiom, "Whatever causes a thing to be such is more so," must be understood of things belonging to one and the same order, as explained above (I:81:2 ad 3). Other things than God are known because of God; not as if He were the first known object, but because He is the first cause of our faculty of knowledge.

Reply to Objection 3. If there existed in our souls a perfect image of God, as the Son is the perfect image of the Father, our mind would know God at once. But the image in our mind is imperfect; hence the argument does not prove.

The Summa Theologiæ of St. Thomas AquinasSecond and Revised Edition, 1920Literally translated by Fathers of the English Dominican ProvinceOnline Edition Copyright © 2017 by Kevin Knight Nihil Obstat. F. Innocentius Apap, O.P., S.T.M., Censor. Theol.Imprimatur. Edus. Canonicus Surmont, Vicarius Generalis. Westmonasterii.APPROBATIO ORDINISNihil Obstat. F. Raphael Moss, O.P., S.T.L. and F. Leo Moore, O.P., S.T.L.Imprimatur. F. Beda Jarrett, O.P., S.T.L., A.M., Prior Provincialis AngliæMARIÆ IMMACULATÆ - SEDI SAPIENTIÆ

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Whether the separated soul can understand anything?

Objection 1. It would seem that the soul separated from the body can understand nothing at all. For the Philosopher says (De Anima i, 4) that "the understanding is corrupted together with its interior principle." But by death all human interior principles are corrupted. Therefore also the intellect itself is corrupted.

Objection 2. Further, the human soul is hindered from understanding when the senses are tied, and by a distracted imagination, as explained above (I:84:8). But death destroys the senses and imagination, as we have shown above (I:77:8). Therefore after death the soul understands nothing.

Objection 3. Further, if the separated soul can understand, this must be by means of some species. But it does not understand by means of innate species, because it has none such; being at first "like a tablet on which nothing is written": nor does it understand by species abstracted from things, for it does not then possess organs of sense and imagination which are necessary for the abstraction of species: nor does it understand by means of species, formerly abstracted and retained in the soul; for if that were so, a child's soul would have no means of understanding at all: nor does it understand by means of intelligible species divinely infused, for such knowledge would not be natural, such as we treat of now, but the effect of grace. Therefore the soul apart from the body understands nothing.

On the contrary, The Philosopher says (De Anima i, 1), "If the soul had no proper operation, it could not be separated from the body." But the soul is separated from the body; therefore it has a proper operation and above all, that which consists in intelligence. Therefore the soul can understand when it is apart from the body.

I answer that, The difficulty in solving this question arises from the fact that the soul united to the body can understand only by turning to the phantasms, as experience shows. Did this not proceed from the soul's very nature, but accidentally through its being bound up with the body, as the Platonists said, the difficulty would vanish; for in that case when the body was once removed, the soul would at once return to its own nature, and would understand intelligible things simply, without turning to the phantasms, as is exemplified in the case of other separate substances. In that case, however, the union of soul and body would not be for the soul's good, for evidently it would understand worse in the body than out of it; but for the good of the body, which would be unreasonable, since matter exists on account of the form, and not the form for the sake of matter. But if we admit that the nature of the soul requires it to understand by turning to the phantasms, it will seem, since death does not change its nature, that it can then naturally understand nothing; as the phantasms are wanting to which it may turn.

To solve this difficulty we must consider that as nothing acts except so far as it is actual, the mode of action in every agent follows from its mode of existence. Now the soul has one mode of being when in the body, and another when apart from it, its nature remaining always the same; but this does not mean that its union with the body is an accidental thing, for, on the contrary, such union belongs to its very nature, just as the nature of a light object is not changed, when it is in its proper place, which is natural to it, and outside its proper place, which is beside its nature. The soul, therefore, when united to the body, consistently with that mode of existence, has a mode of understanding, by turning to corporeal phantasms, which are in corporeal organs; but when it is separated from the body, it has a mode of understanding, by turning to simply intelligible objects, as is proper to other separate substances. Hence it is as natural for the soul to understand by turning to the phantasms as it is for it to be joined to the body; but to be separated from the body is not in accordance with its nature, and likewise to understand without turning to the phantasms is not natural to it; and hence it is united to the body in order that it may have an existence and an operation suitable to its nature. But here again a difficulty arises. For since nature is always ordered to what is best, and since it is better to understand by turning to simply intelligible objects than by turning to the phantasms; God should have ordered the soul's nature so that the nobler way of understanding would have been natural to it, and it would not have needed the body for that purpose.

In order to resolve this difficulty we must consider that while it is true that it is nobler in itself to understand by turning to something higher than to understand by turning to phantasms, nevertheless such a mode of understanding was not so perfect as regards what was possible to the soul. This will appear if we consider that every intellectual substance possesses intellective power by the influence of the Divine light, which is one and simple in its first principle, and the farther off intellectual creatures are from the first principle so much the more is the light divided and diversified, as is the case with lines radiating from the centre of a circle. Hence it is that God by His one Essence understands all things; while the superior intellectual substances understand by means of a number of species, which nevertheless are fewer and more universal and bestow a deeper comprehension of things, because of the efficaciousness of the intellectual power of such natures: whereas the inferior intellectual natures possess a greater number of species, which are less universal, and bestow a lower degree of comprehension, in proportion as they recede from the intellectual power of the higher natures. If, therefore, the inferior substances received species in the same degree of universality as the superior substances, since they are not so strong in understanding, the knowledge which they would derive through them would be imperfect, and of a general and confused nature. We can see this to a certain extent in man, for those who are of weaker intellect fail to acquire perfect knowledge through the universal conceptions of those who have a better understanding, unless things are explained to them singly and in detail. Now it is clear that in the natural order human souls hold the lowest place among intellectual substances. But the perfection of the universe required various grades of being. If, therefore, God had willed souls to understand in the same way as separate substances, it would follow that human knowledge, so far from being perfect, would be confused and general. Therefore to make it possible for human souls to possess perfect and proper knowledge, they were so made that their nature required them to be joined to bodies, and thus to receive the proper and adequate knowledge of sensible things from the sensible things themselves; thus we see in the case of uneducated men that they have to be taught by sensible examples.

It is clear then that it was for the soul's good that it was united to a body, and that it understands by turning to the phantasms. Nevertheless it is possible for it to exist apart from the body, and also to understand in another way.

Reply to Objection 1. The Philosopher's words carefully examined will show that he said this on the previous supposition that understanding is a movement of body and soul as united, just as sensation is, for he had not as yet explained the difference between intellect and sense. We may also say that he is referring to the way of understanding by turning to phantasms. This is also the meaning of the second objection.

Reply to Objection 3. The separated soul does not understand by way of innate species, nor by species abstracted then, nor only by species retained, and this the objection proves; but the soul in that state understands by means of participated species arising from the influence of the Divine light, shared by the soul as by other separate substances; though in a lesser degree. Hence as soon as it ceases to act by turning to corporeal (phantasms), the soul turns at once to the superior things; nor is this way of knowledge unnatural, for God is the author of the influx of both of the light of grace and of the light of nature.


Whether the separated soul understands separate substances?

Objection 1. It would seem that the separated soul does not understand separate substances. For the soul is more perfect when joined to the body than when existing apart from it, being an essential part of human nature; and every part of a whole is more perfect when it exists in that whole. But the soul in the body does not understand separate substances as shown above (I:88:1). Therefore much less is it able to do so when apart from the body.

Objection 2. Further, whatever is known is known either by its presence or by its species. But separate substances cannot be known to the soul by their presence, for God alone can enter into the soul; nor by means of species abstracted by the soul from an angel, for an angel is more simple than a soul. Therefore the separated soul cannot at all understand separate substances.

Objection 3. Further, some philosophers said that the ultimate happiness of man consists in the knowledge of separate substances. If, therefore, the separated soul can understand separate substances, its happiness would be secured by its separation alone; which cannot be reasonably be said.

On the contrary, Souls apart from the body know other separated souls; as we see in the case of the rich man in hell, who saw Lazarus and Abraham (Luke 16:23). Therefore separated souls see the devils and the angels.

I answer that, Augustine says (De Trin. ix, 3), "our mind acquires the knowledge of incorporeal things by itself"—i.e. by knowing itself (I:88:1 ad 1). Therefore from the knowledge which the separated soul has of itself, we can judge how it knows other separate things. Now it was said above (Article 1), that as long as it is united to the body the soul understands by turning to phantasms, and therefore it does not understand itself save through becoming actually intelligent by means of ideas abstracted from phantasms; for thus it understands itself through its own act, as shown above (I:87:1). When, however, it is separated from the body, it understands no longer by turning to phantasms, but by turning to simply intelligible objects; hence in that state it understands itself through itself. Now, every separate substance "understands what is above itself and what is below itself, according to the mode of its substance" (De Causis viii): for a thing is understood according as it is in the one who understands; while one thing is in another according to the nature of that in which it is. And the mode of existence of a separated soul is inferior to that of an angel, but is the same as that of other separated souls. Therefore the soul apart from the body has perfect knowledge of other separated souls, but it has an imperfect and defective knowledge of the angels so far as its natural knowledge is concerned. But the knowledge of glory is otherwise.

Reply to Objection 1. The separated soul is, indeed, less perfect considering its nature in which it communicates with the nature of the body: but it has a greater freedom of intelligence, since the weight and care of the body is a clog upon the clearness of its intelligence in the present life.

Reply to Objection 2. The separated soul understands the angels by means of divinely impressed ideas; which, however, fail to give perfect knowledge of them, forasmuch as the nature of the soul is inferior to that of an angel.

Reply to Objection 3. Man's ultimate happiness consists not in the knowledge of any separate substances; but in the knowledge of God, Who is seen only by grace. The knowledge of other separate substances if perfectly understood gives great happiness—not final and ultimate happiness. But the separated soul does not understand them perfectly, as was shown above in this article.


Whether the separated soul knows all natural things?

Objection 1. It would seem that the separated soul knows all natural things. For the types of all natural things exist in separate substances. Therefore, as separated souls know separate substances, they also know all natural things.

Objection 2. Further, whoever understands the greater intelligible, will be able much more to understand the lesser intelligible. But the separated soul understands immaterial substances, which are in the highest degree of intelligibility. Therefore much more can it understand all natural things which are in a lower degree of intelligibility.

On the contrary, The devils have greater natural knowledge than the separated soul; yet they do not know all natural things, but have to learn many things by long experience, as Isidore says (De Summo Bono i). Therefore neither can the separated soul know all natural things.

I answer that, As stated above (Article 1), the separated soul, like the angels, understands by means of species, received from the influence of the Divine light. Nevertheless, as the soul by nature is inferior to an angel, to whom this kind of knowledge is natural, the soul apart from the body through such species does not receive perfect knowledge, but only a general and confused kind of knowledge. Separated souls, therefore, have the same relation through such species to imperfect and confused knowledge of natural things as the angels have to the perfect knowledge thereof. Now angels through such species know all natural things perfectly; because all that God has produced in the respective natures of natural things has been produced by Him in the angelic intelligence, as Augustine says (Gen. ad lit. ii, 8). Hence it follows that separated souls know all natural things not with a certain and proper knowledge, but in a general and confused manner.

Reply to Objection 1. Even an angel does not understand all natural things through his substance, but through certain species, as stated above (I:87:1). So it does not follow that the soul knows all natural things because it knows separate substances after a fashion.

Reply to Objection 2. As the soul separated from the body does not perfectly understand separate substances, so neither does it know all natural things perfectly; but it knows them confusedly, as above explained in this article.

Reply to Objection 3. Isidore speaks of the knowledge of the future which neither angels, nor demons, nor separated souls, know except so far as future things pre-exist in their causes or are known by Divine revelation. But we are here treating of the knowledge of natural things.

Reply to Objection 4. Knowledge acquired here by study is proper and perfect; the knowledge of which we speak is confused. Hence it does not follow that to study in order to learn is useless.


Whether the separated soul knows singulars?

Objection 1. It would seem that the separated soul does not know singulars. For no cognitive power besides the intellect remains in the separated soul, as is clear from what has been said above (I:77:8). But the intellect cannot know singulars, as we have shown (I:86:1. Therefore the separated soul cannot know singulars.

Objection 2. Further, the knowledge of the singular is more determinate than knowledge of the universal. But the separated soul has no determinate knowledge of the species of natural things, therefore much less can it know singulars.

Objection 3. Further, if it knew the singulars, yet not by sense, for the same reason it would know all singulars. But it does not know all singulars. Therefore it knows none.

On the contrary, The rich man in hell said: "I have five brethren" (Luke 16:28).

I answer that, Separated souls know some singulars, but not all, not even all present singulars. To understand this, we must consider that there is a twofold way of knowing things, one by means of abstraction from phantasms, and in this way singulars cannot be directly known by the intellect, but only indirectly, as stated above (I:86:1). The other way of understanding is by the infusion of species by God, and in that way it is possible for the intellect to know singulars. For as God knows all things, universal and singular, by His Essence, as the cause of universal and individual principles (I:14:2, so likewise separate substances can know singulars by species which are a kind of participated similitude of the Divine Essence. There is a difference, however, between angels and separated souls in the fact that through these species the angels have a perfect and proper knowledge of things; whereas separated have only a confused knowledge. Hence the angels, by reason of their perfect intellect, through these species, know not only the specific natures of things, but also the singulars contained in those species; whereas separated souls by these species know only those singulars to which they are determined by former knowledge in this life, or by some affection, or by natural aptitude, or by the disposition of the Divine order; because whatever is received into anything is conditioned according to the mode of the recipient.

Reply to Objection 1. The intellect does not know the singular by way of abstraction; neither does the separated soul know it thus; but as explained above.

Reply to Objection 2. The knowledge of the separated soul is confined to those species or individuals to which the soul has some kind of determinate relation, as we have said.

Reply to Objection 3. The separated soul has not the same relation to all singulars, but one relation to some, and another to others. Therefore there is not the same reason why it should know all singulars.


Whether the habit of knowledge here acquired remains in the separated soul?

Objection 1. It would seem that the habit of knowledge acquired in this life does not remain in the soul separated from the body: for the Apostle says: "Knowledge shall be destroyed" (1 Corinthians 13:8).

Objection 2. Further, some in this world who are less good enjoy knowledge denied to others who are better. If, therefore, the habit of knowledge remained in the soul after death, it would follow that some who are less good would, even in the future life, excel some who are better; which seems unreasonable.

Objection 3. Further, separated souls will possess knowledge by influence of the Divine light. Supposing, therefore, that knowledge here acquired remained in the separated soul, it would follow that two forms of the same species would co-exist in the same subject which cannot be.

Objection 4. Further, the Philosopher says (Praedic. vi, 4,5), that "a habit is a quality hard to remove: yet sometimes knowledge is destroyed by sickness or the like." But in this life there is no change so thorough as death. Therefore it seems that the habit of knowledge is destroyed by death.

On the contrary, Jerome says (Ep. liii, ad Paulinum), "Let us learn on earth that kind of knowledge which will remain with us in heaven."

I answer that, Some say that the habit of knowledge resides not in the intellect itself, but in the sensitive powers, namely, the imaginative, cogitative, and memorative, and that the intelligible species are not kept in the passive intellect. If this were true, it would follow that when the body is destroyed by death, knowledge here acquired would also be entirely destroyed.

But, since knowledge resides in the intellect, which is "the abode of species," as the Philosopher says (De Anima iii, 4), the habit of knowledge here acquired must be partly in the aforesaid sensitive powers and partly in the intellect. This can be seen by considering the very actions from which knowledge arises. For "habits are like the actions whereby they are acquired" (Ethic. ii, 1). Now the actions of the intellect, by which knowledge is here acquired, are performed by the mind turning to the phantasms in the aforesaid sensitive powers. Hence through such acts the passive intellect acquires a certain facility in considering the species received: and the aforesaid sensitive powers acquire a certain aptitude in seconding the action of the intellect when it turns to them to consider the intelligible object. But as the intellectual act resides chiefly and formally in the intellect itself, whilst it resides materially and dispositively in the inferior powers, the same distinction is to be applied to habit.

Knowledge, therefore, acquired in the present life does not remain in the separated soul, as regards what belongs to the sensitive powers; but as regards what belongs to the intellect itself, it must remain; because, as the Philosopher says (De Long. et Brev. Vitae ii), a form may be corrupted in two ways; first, directly, when corrupted by its contrary, as heat, by cold; and secondly, indirectly, when its subject is corrupted. Now it is evident that human knowledge is not corrupted through corruption of the subject, for the intellect is an incorruptible faculty, as above stated (I:79:2 ad 2). Neither can the intelligible species in the passive intellect be corrupted by their contrary; for there is no contrary to intelligible "intentions," above all as regards simple intelligence of "what a thing is." But contrariety may exist in the intellect as regards mental composition and division, or also reasoning; so far as what is false in statement or argument is contrary to truth. And thus knowledge may be corrupted by its contrary when a false argument seduces anyone from the knowledge of truth. For this reason the Philosopher in the above work mentions two ways in which knowledge is corrupted directly: namely, "forgetfulness" on the part of the memorative power, and "deception" on the part of a false argument. But these have no place in the separated soul. Therefore we must conclude that the habit of knowledge, so far as it is in the intellect, remains in the separated soul.

Reply to Objection 1. The Apostle is not speaking of knowledge as a habit, but as to the act of knowing; and hence he says, in proof of the assertion quoted, "Now, I know in part."

Reply to Objection 2. As a less good man may exceed a better man in bodily stature, so the same kind of man may have a habit of knowledge in the future life which a better man may not have. Such knowledge, however, cannot be compared with the other prerogatives enjoyed by the better man.

Reply to Objection 3. These two kinds of knowledge are not of the same species, so there is no impossibility.

Reply to Objection 4. This objection considers the corruption of knowledge on the part of the sensitive powers.


Whether the act of knowledge acquired here remains in the separated soul?

Objection 1. It would seem that the act of knowledge here acquired does not remain in the separated soul. For the Philosopher says (De Anima i, 4), that when the body is corrupted, "the soul neither remembers nor loves." But to consider what is previously known is an act of memory. Therefore the separated soul cannot retain an act of knowledge here acquired.

Objection 2. Further, intelligible species cannot have greater power in the separated soul than they have in the soul united to the body. But in this life we cannot understand by intelligible species without turning to phantasms, as shown above (I:84:7). Therefore the separated soul cannot do so, and thus it cannot understand at all by intelligible species acquired in this life.

Objection 3. Further, the Philosopher says (Ethic. ii, 1), that "habits produce acts similar to those whereby they are acquired." But the habit of knowledge is acquired here by acts of the intellect turning to phantasms: therefore it cannot produce any other acts. These acts, however, are not adapted to the separated soul. Therefore the soul in the state of separation cannot produce any act of knowledge acquired in this life.

On the contrary, It was said to Dives in hell (Luke 16:25): "Remember thou didst receive good things in thy lifetime."

I answer that, Action offers two things for our consideration—its species and its mode. Its species comes from the object, whereto the faculty of knowledge is directed by the (intelligible) species, which is the object's similitude; whereas the mode is gathered from the power of the agent. Thus that a person see a stone is due to the species of the stone in his eye; but that he see it clearly, is due to the eye's visual power. Therefore as the intelligible species remain in the separated soul, as stated above (Article 5), and since the state of the separated soul is not the same as it is in this life, it follows that through the intelligible species acquired in this life the soul apart from the body can understand what it understood formerly, but in a different way; not by turning to phantasms, but by a mode suited to a soul existing apart from the body. Thus the act of knowledge here acquired remains in the separated soul, but in a different way.

Reply to Objection 1. The Philosopher speaks of remembrance, according as memory belongs to the sensitive part, but not as belonging in a way to the intellect, as explained above (I:79:6).

Reply to Objection 2. The different mode of intelligence is produced by the different state of the intelligent soul; not by diversity of species.

Reply to Objection 3. The acts which produce a habit are like the acts caused by that habit, in species, but not in mode. For example, to do just things, but not justly, that is, pleasurably, causes the habit of political justice, whereby we act pleasurably. (Cf. Aristotle, Ethic. v, 8: Magn. Moral. i, 34).


Whether local distance impedes the knowledge in the separated soul?

Objection 1. It would seem that local distance impedes the separated soul's knowledge. For Augustine says (De Cura pro Mort. xiii), that "the souls of the dead are where they cannot know what is done here." But they know what is done among themselves. Therefore local distance impedes the knowledge in the separated soul.

Objection 2. Further, Augustine says (De Divin. Daemon. iii), that "the demon's rapidity of movement enables them to tell things unknown to us." But agility of movement would be useless in that respect unless their knowledge was impeded by local distance; which, therefore, is a much greater hindrance to the knowledge of the separated soul, whose nature is inferior to the demon's.

Objection 3. Further, as there is distance of place, so is there distance of time. But distance of time impedes knowledge in the separated soul, for the soul is ignorant of the future. Therefore it seems that distance of place also impedes its knowledge.

On the contrary, It is written (Luke 16:23), that Dives, "lifting up his eyes when he was in torment, saw Abraham afar off." Therefore local distance does not impede knowledge in the separated soul.

I answer that, Some have held that the separated soul knows the singular by abstraction from the sensible. If that were so, it might be that local distance would impede its knowledge; for either the sensible would need to act upon the soul, or the soul upon the sensible, and in either case a determinate distance would be necessary. This is, however, impossible because abstraction of the species from the sensible is done through the senses and other sensible faculties which do not remain actually in the soul apart from the body. But the soul when separated understands singulars by species derived from the Divine light, which is indifferent to what is near or distant. Hence knowledge in the separated soul is not hindered by local distance.

Reply to Objection 1. Augustine says that the souls of the departed cannot see what is done here, not because they are 'there,' as if impeded by local distance; but for some other cause, as we shall explain (Article 8).

Reply to Objection 2. Augustine speaks there in accordance with the opinion that demons have bodies naturally united to them, and so have sensitive powers, which require local distance. In the same book he expressly sets down this opinion, though apparently rather by way of narration than of assertion, as we may gather from De Civ. Dei xxi, 10.

Reply to Objection 3. The future, which is distant in time, does not actually exist, and therefore is not knowable in itself, because so far as a thing falls short of being, so far does it fall short of being knowable. But what is locally distant exists actually, and is knowable in itself. Hence we cannot argue from distance of time to distance of place.


Whether separated souls know that takes place on earth?

Objection 1. It would seem that separated souls know what takes place on earth; for otherwise they would have no care for it, as they have, according to what Dives said (Luke 16:27-28), "I have five brethren . . . he may testify unto them, lest they also come into the place of torments." Therefore separated souls know what passes on earth.

Objection 2. Further, the dead often appear to the living, asleep or awake, and tell them of what takes place there; as Samuel appeared to Saul (1 Samuel 28:11). But this could not be unless they knew what takes place here. Therefore they know what takes place on earth.

Objection 3. Further, separated souls know what happens among themselves. If, therefore, they do not know what takes place among us, it must be by reason of local distance; which has been shown to be false (Article 7).

On the contrary, It is written (Job 14:21): "He will not understand whether his children come to honor or dishonor."

I answer that, By natural knowledge, of which we are treating now, the souls of the dead do not know what passes on earth. This follows from what has been laid down (Article 4), since the separated soul has knowledge of singulars, by being in a way determined to them, either by some vestige of previous knowledge or affection, or by the Divine order. Now the souls departed are in a state of separation from the living, both by Divine order and by their mode of existence, whilst they are joined to the world of incorporeal spiritual substances; and hence they are ignorant of what goes on among us. Whereof Gregory gives the reason thus: "The dead do not know how the living act, for the life of the spirit is far from the life of the flesh; and so, as corporeal things differ from incorporeal in genus, so they are distinct in knowledge" (Moral. xii). Augustine seems to say the same (De Cura pro Mort. xiii), when he asserts that, "the souls of the dead have no concern in the affairs of the living."

Gregory and Augustine, however, seem to be divided in opinion as regards the souls of the blessed in heaven, for Gregory continues the passage above quoted: "The case of the holy souls is different, for since they see the light of Almighty God, we cannot believe that external things are unknown to them." But Augustine (De Cura pro Mort. xiii) expressly says: "The dead, even the saints do not know what is done by the living or by their own children," as a gloss quotes on the text, "Abraham hath not known us" (Isaiah 63:16). He confirms this opinion by saying that he was not visited, nor consoled in sorrow by his mother, as when she was alive; and he could not think it possible that she was less kind when in a happier state; and again by the fact that the Lord promised to king Josias that he should die, lest he should see his people's afflictions (2 Kings 22:20). Yet Augustine says this in doubt; and premises, "Let every one take, as he pleases, what I say." Gregory, on the other hand, is positive, since he says, "We cannot believe." His opinion, indeed, seems to be the more probable one—that the souls of the blessed who see God do know all that passes here. For they are equal to the angels, of whom Augustine says that they know what happens among those living on earth. But as the souls of the blessed are most perfectly united to Divine justice, they do not suffer from sorrow, nor do they interfere in mundane affairs, except in accordance with Divine justice.

Reply to Objection 1. The souls of the departed may care for the living, even if ignorant of their state; just as we care for the dead by pouring forth prayer on their behalf, though we are ignorant of their state. Moreover, the affairs of the living can be made known to them not immediately, but the souls who pass hence thither, or by angels and demons, or even by "the revelation of the Holy Ghost," as Augustine says in the same book.

Reply to Objection 2. That the dead appear to the living in any way whatever is either by the special dispensation of God; in order that the souls of the dead may interfere in affairs of the living—and this is to be accounted as miraculous. Or else such apparitions occur through the instrumentality of bad or good angels, without the knowledge of the departed; as may likewise happen when the living appear, without their own knowledge, to others living, as Augustine says in the same book. And so it may be said of Samuel that he appeared through Divine revelation; according to Sirach 46:23, "he slept, and told the king the end of his life." Or, again, this apparition was procured by the demons; unless, indeed, the authority of Ecclesiasticus be set aside through not being received by the Jews as canonical Scripture.

Reply to Objection 3. This kind of ignorance does not proceed from the obstacle of local distance, but from the cause mentioned above.

The Summa Theologiæ of St. Thomas AquinasSecond and Revised Edition, 1920Literally translated by Fathers of the English Dominican ProvinceOnline Edition Copyright © 2017 by Kevin Knight Nihil Obstat. F. Innocentius Apap, O.P., S.T.M., Censor. Theol.Imprimatur. Edus. Canonicus Surmont, Vicarius Generalis. Westmonasterii.APPROBATIO ORDINISNihil Obstat. F. Raphael Moss, O.P., S.T.L. and F. Leo Moore, O.P., S.T.L.Imprimatur. F. Beda Jarrett, O.P., S.T.L., A.M., Prior Provincialis AngliæMARIÆ IMMACULATÆ - SEDI SAPIENTIÆ

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Whether the soul was made or was of God's substance?

Objection 1. It would seem that the soul was not made, but was God's substance. For it is written (Genesis 2:7): "God formed man of the slime of the earth, and breathed into his face the breath of life, and man was made a living soul." But he who breathes sends forth something of himself. Therefore the soul, whereby man lives, is of the Divine substance.

Objection 2. Further, as above explained (I:75:5, the soul is a simple form. But a form is an act. Therefore the soul is a pure act; which applies to God alone. Therefore the soul is of God's substance.

Objection 3. Further, things that exist and do differ are the same. But God and the mind exist, and in no way differ, for they could only be differentiated by certain differences, and thus would be composite. Therefore God and the human mind are the same.

On the contrary, Augustine (De Orig. Animae iii, 15) mentions certain opinions which he calls "exceedingly and evidently perverse, and contrary to the Catholic Faith," among which the first is the opinion that "God made the soul not out of nothing, but from Himself."

I answer that, To say that the soul is of the Divine substance involves a manifest improbability. For, as is clear from what has been said (I:77:2; I:79:2; I:84:6), the human soul is sometimes in a state of potentiality to the act of intelligence—acquires its knowledge somehow from things—and thus has various powers; all of which are incompatible with the Divine Nature, Which is a pure act—receives nothing from any other—and admits of no variety in itself, as we have proved (I:3:7; I:9:1).

This error seems to have originated from two statements of the ancients. For those who first began to observe the nature of things, being unable to rise above their imagination, supposed that nothing but bodies existed. Therefore they said that God was a body, which they considered to be the principle of other bodies. And since they held that the soul was of the same nature as that body which they regarded as the first principle, as is stated De Anima i, 2, it followed that the soul was of the nature of God Himself. According to this supposition, also, the Manichaeans, thinking that God was corporeal light, held that the soul was part of that light bound up with the body.

Then a further step in advance was made, and some surmised the existence of something incorporeal, not apart from the body, but the form of a body; so that Varro said, "God is a soul governing the world by movement and reason," as Augustine relates (De Civ. Dei vii, 6. The words as quoted are to be found iv. 31.) So some supposed man's soul to be part of that one soul, as man is a part of the whole world; for they were unable to go so far as to understand the different degrees of spiritual substance, except according to the distinction of bodies.

But, all these theories are impossible, as proved above (I:3:8 and I:75:1), wherefore it is evidently false that the soul is of the substance of God.

Reply to Objection 1. The term "breathe" is not to be taken in the material sense; but as regards the act of God, to breathe [spirare], is the same as to "make a spirit." Moreover, in the material sense, man by breathing does not send forth anything of his own substance, but an extraneous thing.

Reply to Objection 2. Although the soul is a simple form in its essence, yet it is not its own existence, but is a being by participation, as above explained (I:75:5 ad 4). Therefore it is not a pure act like God.

Reply to Objection 3. That which differs, properly speaking, differs in something; wherefore we seek for difference where we find also resemblance. For this reason things which differ must in some way be compound; since they differ in something, and in something resemble each other. In this sense, although all that differ are diverse, yet all things that are diverse do not differ. For simple things are diverse; yet do not differ from one another by differences which enter into their composition. For instance, a man and a horse differ by the difference of rational and irrational; but we cannot say that these again differ by some further difference.


Whether the soul was produced by creation?

Objection 1. It would seem that the soul was not produced by creation. For that which has in itself something material is produced from matter. But the soul is in part material, since it is not a pure act. Therefore the soul was made of matter; and hence it was not created.

Objection 2. Further, every actuality of matter is educed from the potentiality of that matter; for since matter is in potentiality to act, any act pre-exists in matter potentially. But the soul is the act of corporeal matter, as is clear from its definition. Therefore the soul is educed from the potentiality of matter.

Objection 3. Further, the soul is a form. Therefore, if the soul is created, all other forms also are created. Thus no forms would come into existence by generation; which is not true.

On the contrary, It is written (Genesis 1:27): "God created man to His own image." But man is like to God in his soul. Therefore the soul was created.

I answer that, The rational soul can be made only by creation; which, however, is not true of other forms. The reason is because, since to be made is the way to existence, a thing must be made in such a way as is suitable to its mode of existence. Now that properly exists which itself has existence; as it were, subsisting in its own existence. Wherefore only substances are properly and truly called beings; whereas an accident has not existence, but something is (modified) by it, and so far is it called a being; for instance, whiteness is called a being, because by it something is white. Hence it is said Metaph. vii, Did. vi, 1 that an accident should be described as "of something rather than as something." The same is to be said of all non-subsistent forms. Therefore, properly speaking, it does not belong to any non-existing form to be made; but such are said to be made through the composite substances being made. On the other hand, the rational soul is a subsistent form, as above explained (I:75:2. Wherefore it is competent to be and to be made. And since it cannot be made of pre-existing matter—whether corporeal, which would render it a corporeal being—or spiritual, which would involve the transmutation of one spiritual substance into another, we must conclude that it cannot exist except by creation.

Reply to Objection 1. The soul's simple essence is as the material element, while its participated existence is its formal element; which participated existence necessarily co-exists with the soul's essence, because existence naturally follows the form. The same reason holds if the soul is supposed to be composed of some spiritual matter, as some maintain; because the said matter is not in potentiality to another form, as neither is the matter of a celestial body; otherwise the soul would be corruptible. Wherefore the soul cannot in any way be made of pre-existent matter.

Reply to Objection 2. The production of act from the potentiality of matter is nothing else but something becoming actually that previously was in potentiality. But since the rational soul does not depend in its existence on corporeal matter, and is subsistent, and exceeds the capacity of corporeal matter, as we have seen (I:75:2, it is not educed from the potentiality of matter.

Reply to Objection 3. As we have said, there is no comparison between the rational soul and other forms.


Whether the rational soul is produced by God immediately?

Objection 1. It would seem that the rational soul is not immediately made by God, but by the instrumentality of the angels. For spiritual things have more order than corporeal things. But inferior bodies are produced by means of the superior, as Dionysius says (Div. Nom. iv). Therefore also the inferior spirits, who are the rational souls, are produced by means of the superior spirits, the angels.

Objection 2. Further, the end corresponds to the beginning of things; for God is the beginning and end of all. Therefore the issue of things from their beginning corresponds to the forwarding of them to their end. But "inferior things are forwarded by the higher," as Dionysius says (Eccl. Hier. v); therefore also the inferior are produced into existence by the higher, and souls by angels.

Objection 3. Further, "perfect is that which can produce its like," as is stated Metaph. v. But spiritual substances are much more perfect than corporeal. Therefore, since bodies produce their like in their own species, much more are angels able to produce something specifically inferior to themselves; and such is the rational soul.

On the contrary, It is written (Genesis 2:7) that God Himself "breathed into the face of man the breath of life."

I answer that, Some have held that angels, acting by the power of God, produce rational souls. But this is quite impossible, and is against faith. For it has been proved that the rational soul cannot be produced except by creation. Now, God alone can create; for the first agent alone can act without presupposing the existence of anything; while the second cause always presupposes something derived from the first cause, as above explained (I:75:3: and every agent, that presupposes something to its act, acts by making a change therein. Therefore everything else acts by producing a change, whereas God alone acts by creation. Since, therefore, the rational soul cannot be produced by a change in matter, it cannot be produced, save immediately by God.

Thus the replies to the objections are clear. For that bodies produce their like or something inferior to themselves, and that the higher things lead forward the inferior—all these things are effected through a certain transmutation.


Whether the human soul was produced before the body?

Objection 1. It would seem that the human soul was made before the body. For the work of creation preceded the work of distinction and adornment, as shown above (I:66:1; I:70:1). But the soul was made by creation; whereas the body was made at the end of the work of adornment. Therefore the soul of man was made before the body.

Objection 2. Further, the rational soul has more in common with the angels than with the brute animals. But angels were created before bodies, or at least, at the beginning with corporeal matter; whereas the body of man was formed on the sixth day, when also the animals were made. Therefore the soul of man was created before the body.

Objection 3. Further, the end is proportionate to the beginning. But in the end the soul outlasts the body. Therefore in the beginning it was created before the body.

On the contrary, The proper act is produced in its proper potentiality. Therefore since the soul is the proper act of the body, the soul was produced in the body.

I answer that, Origen (Peri Archon i, 7,8) held that not only the soul of the first man, but also the souls of all men were created at the same time as the angels, before their bodies: because he thought that all spiritual substances, whether souls or angels, are equal in their natural condition, and differ only by merit; so that some of them—namely, the souls of men or of heavenly bodies—are united to bodies while others remain in their different orders entirely free from matter. Of this opinion we have already spoken (I:47:2; and so we need say nothing about it here.

Augustine, however (Gen. ad lit. vii, 24), says that the soul of the first man was created at the same time as the angels, before the body, for another reason; because he supposes that the body of man, during the work of the six days, was produced, not actually, but only as to some "causal virtues"; which cannot be said of the soul, because neither was it made of any pre-existing corporeal or spiritual matter, nor could it be produced from any created virtue. Therefore it seems that the soul itself, during the work of the six days, when all things were made, was created, together with the angels; and that afterwards, by its own will, was joined to the service of the body. But he does not say this by way of assertion; as his words prove. For he says (Gen. ad lit. vii, 29): "We may believe, if neither Scripture nor reason forbid, that man was made on the sixth day, in the sense that his body was created as to its causal virtue in the elements of the world, but that the soul was already created."

Now this could be upheld by those who hold that the soul has of itself a complete species and nature, and that it is not united to the body as its form, but as its administrator. But if the soul is united to the body as its form, and is naturally a part of human nature, the above supposition is quite impossible. For it is clear that God made the first things in their perfect natural state, as their species required. Now the soul, as a part of human nature, has its natural perfection only as united to the body. Therefore it would have been unfitting for the soul to be created without the body.

Therefore, if we admit the opinion of Augustine about the work of the six days (I:74:2, we may say that the human soul preceded in the work of the six days by a certain generic similitude, so far as it has intellectual nature in common with the angels; but was itself created at the same time as the body. According to the other saints, both the body and soul of the first man were produced in the work of the six days.

Reply to Objection 1. If the soul by its nature were a complete species, so that it might be created as to itself, this reason would prove that the soul was created by itself in the beginning. But as the soul is naturally the form of the body, it was necessarily created, not separately, but in the body.

Reply to Objection 2. The same observation applies to the second objection. For if the soul had a species of itself it would have something still more in common with the angels. But, as the form of the body, it belongs to the animal genus, as a formal principle.

Reply to Objection 3. That the soul remains after the body, is due to a defect of the body, namely, death. Which defect was not due when the soul was first created.

The Summa Theologiæ of St. Thomas AquinasSecond and Revised Edition, 1920Literally translated by Fathers of the English Dominican ProvinceOnline Edition Copyright © 2017 by Kevin Knight Nihil Obstat. F. Innocentius Apap, O.P., S.T.M., Censor. Theol.Imprimatur. Edus. Canonicus Surmont, Vicarius Generalis. Westmonasterii.APPROBATIO ORDINISNihil Obstat. F. Raphael Moss, O.P., S.T.L. and F. Leo Moore, O.P., S.T.L.Imprimatur. F. Beda Jarrett, O.P., S.T.L., A.M., Prior Provincialis AngliæMARIÆ IMMACULATÆ - SEDI SAPIENTIÆ

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Whether the body of the first man was made of the slime of the earth?

Objection 1. It would seem that the body of the first man was not made of the slime of the earth. For it is an act of greater power to make something out of nothing than out of something; because "not being" is farther off from actual existence than "being in potentiality." But since man is the most honorable of God's lower creatures, it was fitting that in the production of man's body, the power of God should be most clearly shown. Therefore it should not have been made of the slime of the earth, but out of nothing.

Objection 2. Further, the heavenly bodies are nobler than earthly bodies. But the human body has the greatest nobility; since it is perfected by the noblest form, which is the rational soul. Therefore it should not be made of an earthly body, but of a heavenly body.

Objection 3. Further, fire and air are nobler than earth and water, as is clear from their subtlety. Therefore, since the human body is most noble, it should rather have been made of fire and air than of the slime of the earth.

Objection 4. Further, the human body is composed of the four elements. Therefore it was not made of the slime of the earth, but of the four elements.

On the contrary, It is written (Genesis 2:7): "God made man of the slime of the earth."

I answer that, As God is perfect in His works, He bestowed perfection on all of them according to their capacity: "God's works are perfect" (Deuteronomy 32:4). He Himself is simply perfect by the fact that "all things are pre-contained" in Him, not as component parts, but as "united in one simple whole," as Dionysius says (Div. Nom. v); in the same way as various effects pre-exist in their cause, according to its one virtue. This perfection is bestowed on the angels, inasmuch as all things which are produced by God in nature through various forms come under their knowledge. But on man this perfection is bestowed in an inferior way. For he does not possess a natural knowledge of all natural things, but is in a manner composed of all things, since he has in himself a rational soul of the genus of spiritual substances, and in likeness to the heavenly bodies he is removed from contraries by an equable temperament. As to the elements, he has them in their very substance, yet in such a way that the higher elements, fire and air, predominate in him by their power; for life is mostly found where there is heat, which is from fire; and where there is humor, which is of the air. But the inferior elements abound in man by their substance; otherwise the mingling of elements would not be evenly balanced, unless the inferior elements, which have the less power, predominated in quantity. Therefore the body of man is said to have been formed from the slime of the earth; because earth and water mingled are called slime, and for this reason man is called 'a little world,' because all creatures of the world are in a way to be found in him.

Reply to Objection 1. The power of the Divine Creator was manifested in man's body when its matter was produced by creation. But it was fitting that the human body should be made of the four elements, that man might have something in common with the inferior bodies, as being something between spiritual and corporeal substances.

Reply to Objection 2. Although the heavenly body is in itself nobler than the earthly body, yet for the acts of the rational soul the heavenly body is less adapted. For the rational soul receives the knowledge of truth in a certain way through the senses, the organs of which cannot be formed of a heavenly body which is impassible. Nor is it true that something of the fifth essence enters materially into the composition of the human body, as some say, who suppose that the soul is united to the body by means of light. For, first of all, what they say is false—that light is a body.

Secondly, it is impossible for something to be taken from the fifth essence, or from a heavenly body, and to be mingled with the elements, since a heavenly body is impassible; wherefore it does not enter into the composition of mixed bodies, except as in the effects of its power.

Reply to Objection 3. If fire and air, whose action is of greater power, predominated also in quantity in the human body, they would entirely draw the rest into themselves, and there would be no equality in the mingling, such as is required in the composition of man, for the sense of touch, which is the foundation of the other senses. For the organ of any particular sense must not actually have the contraries of which that sense has the perception, but only potentially; either in such a way that it is entirely void of the whole "genus" of such contraries—thus, for instance, the pupil of the eye is without color, so as to be in potentiality as regards all colors; which is not possible in the organ of touch, since it is composed of the very elements, the qualities of which are perceived by that sense—or so that the organ is a medium between two contraries, as much needs be the case with regard to touch; for the medium is in potentiality to the extremes.

Reply to Objection 4. In the slime of the earth are earth, and water binding the earth together. Of the other elements, Scripture makes no mention, because they are less in quantity in the human body, as we have said; and because also in the account of the Creation no mention is made of fire and air, which are not perceived by senses of uncultured men such as those to whom the Scripture was immediately addressed.


Whether the human body was immediately produced by God?

Objection 1. It would seem that the human body was not produced by God immediately. For Augustine says (De Trin. iii, 4), that "corporeal things are disposed by God through the angels." But the human body was made of corporeal matter, as stated above (Article 1). Therefore it was produced by the instrumentality of the angels, and not immediately by God.

Objection 2. Further, whatever can be made by a created power, is not necessarily produced immediately by God. But the human body can be produced by the created power of a heavenly body; for even certain animals are produced from putrefaction by the active power of a heavenly body; and Albumazar says that man is not generated where heat and cold are extreme, but only in temperate regions. Therefore the human body was not necessarily produced immediately by God.

Objection 3. Further, nothing is made of corporeal matter except by some material change. But all corporeal change is caused by a movement of a heavenly body, which is the first movement. Therefore, since the human body was produced from corporeal matter, it seems that a heavenly body had part in its production.

Objection 4. Further, Augustine says (Gen. ad lit. vii, 24) that man's body was made during the work of the six days, according to the causal virtues which God inserted in corporeal creatures; and that afterwards it was actually produced. But what pre-exists in the corporeal creature by reason of causal virtues can be produced by some corporeal body. Therefore the human body was produced by some created power, and not immediately by God.

On the contrary, It is written (Sirach 17:1): "God created man out of the earth."

I answer that, The first formation of the human body could not be by the instrumentality of any created power, but was immediately from God. Some, indeed, supposed that the forms which are in corporeal matter are derived from some immaterial forms; but the Philosopher refutes this opinion (Metaph. vii), for the reason that forms cannot be made in themselves, but only in the composite, as we have explained (I:65:4; and because the agent must be like its effect, it is not fitting that a pure form, not existing in matter, should produce a form which is in matter, and which form is only made by the fact that the composite is made. So a form which is in matter can only be the cause of another form that is in matter, according as composite is made by composite. Now God, though He is absolutely immaterial, can alone by His own power produce matter by creation: wherefore He alone can produce a form in matter, without the aid of any preceding material form. For this reason the angels cannot transform a body except by making use of something in the nature of a seed, as Augustine says (De Trin. iii, 19). Therefore as no pre-existing body has been formed whereby another body of the same species could be generated, the first human body was of necessity made immediately by God.

Reply to Objection 1. Although the angels are the ministers of God, as regards what He does in bodies, yet God does something in bodies beyond the angels' power, as, for instance, raising the dead, or giving sight to the blind: and by this power He formed the body of the first man from the slime of the earth. Nevertheless the angels could act as ministers in the formation of the body of the first man, in the same way as they will do at the last resurrection by collecting the dust.

Reply to Objection 2. Perfect animals, produced from seed, cannot be made by the sole power of a heavenly body, as Avicenna imagined; although the power of a heavenly body may assist by co-operation in the work of natural generation, as the Philosopher says (Phys. ii, 26), "man and the sun beget man from matter." For this reason, a place of moderate temperature is required for the production of man and other animals. But the power of heavenly bodies suffices for the production of some imperfect animals from properly disposed matter: for it is clear that more conditions are required to produce a perfect than an imperfect thing.

Reply to Objection 3. The movement of the heavens causes natural changes; but not changes that surpass the order of nature, and are caused by the Divine Power alone, as for the dead to be raised to life, or the blind to see: like to which also is the making of man from the slime of the earth.

Reply to Objection 4. An effect may be said to pre-exist in the causal virtues of creatures, in two ways.

First, both in active and in passive potentiality, so that not only can it be produced out of pre-existing matter, but also that some pre-existing creature can produce it.

Secondly, in passive potentiality only; that is, that out of pre-existing matter it can be produced by God. In this sense, according to Augustine, the human body pre-existed in the previous work in their causal virtues.