Reason in itself confounded
Saw division grow together;
To themselves yet either neither,
Simple were so well compounded,
That it cried "How true a twain
Seemeth this concordant one:
Love hath reason, Reason none,
If what parts can so remain."
Whereupon it made this threne
To the Phoenix and the dove,
Co-supremes and stars of love,
As chorus to their tragic scene.
Threnos
Beauty, Truth, and Rarity,
Grace in all simplicity,
Here enclosed, in cinders lie.
In the original publication of “Let the bird of loudest lay,” this section of the poem was separated from the preceding lines by a page break. 
 Therenos literally means lamentation and this is the earliest cited usage of the word by the Oxford English Dictionary. 
 It was used by Peacham in 1593 – before “Let the bird of loudest lay” was published.  He defined it as: 
 “A form of speech by which the orator lamenteth some person or people for the misery they suffer.”
The Phoenix and the Turtle