My dear child,
Please to fancy, if you can, that you are reading a real letter, from a real friend whom you have seen, and whose voice you can seem to yourself to hear, wishing you, as I do now with all my heart, a happy Easter.
Do you know that delicious dreamy feeling, when one first wakes on a summer morning, with the twitter of birds in the air, lying lazily with eyes half shut, one sees as in a dream green boughs waving, or waters rippling in a golden light? It is a pleasure very near to sadness, bringing tears to one's eyes like a beautiful picture or poem. And is not that a Mother's gentle hand that undraws your curtains, and a Mother's sweet voice that summons you to rise? To rise and forget, in the bright sunlight, the ugly dreams that frightened you so when all was dark -- to rise and enjoy another happy day, first kneeling to thank that unseen Friend who sends you the beautiful sun?
Are these strange words from a writer of such tales as "Alice"? And is this a strange letter to find in a book of nonsense? It may be so. Some perhaps may blame me for thus mixing together things grave and gay; others may smile and think it odd that any one should think of solemn things at all, except in Church and on a Sunday: but I think -- nay, I am sure -- that some children will read this gently and lovingly, and in the spirit in which I have written it.
For I do not believe God means us thus to divide life into two halves -- to wear a grave face on Sunday, and to think it out-of-place to even so much as mention Him on a week-day.  Do you think He cares to see only kneeling figures and to hear only tones of prayer -- and that He does not also love to see the lambs leaping in the sunlight, and to hear the merry voices of the children, as they roll among the hay?  Surely their innocent laughter is as sweet in His ears as the grandest anthem that ever rolled up from the "dim religious light" of some solemn cathedral?
The  Easter Greeting   has been tipped in  the 1st edition and 1st printing of  The Hunting of the Snark  (April 1876) at front end paper on Lewis Carroll’s (C. L. Dodgson’s) expense. Also he payed for the printing by James Parker & Co. (Oxford, 1876) on cream laid fine paper (watermarked by E. Towgood). 
 This looks as if Carroll breaks character, as there is a strong contrast to the nonsense poem with  all its riddles and strange illustrations. 
 However, Carroll also had to think about how his “dark” Snark would be anticipated by readers of all ages. Did he fear it would by too dark? In Henry Holiday’s view,  “L. C. forgot that ‘the Snark’ is a tragedy”  already during writing the poem. Short before the  Snark  went to the market, Carroll just may have tried to soothe the 1st edition a bit further by introducing the book to its first with an  Easter Greeting .
An Easter Greeting