A poem by Thomas Thornburg from Ancient Letters

Setting this down for you to keep
(White snows deepen the white night)
When you are gone from me in sleep.
Still the night deepens and the deep
Muffles your face, the face of forms from sight
Setting this down for you. To keep
This human faith with you I steep
These words, and not to make you weep
When you are gone from me. In sleep
Or in a dream of sleep, the sweep
Of darkness buoys us and we light,
Setting this down. For you to keep
Yourself from me in such a selfless sleep:
Eighth in a cave, a modern mythic night!
When you are gone from me, in sleep
I know that I shall find you, in the leap
Of day that dazzles dark, a bright
Setting this down for you, to keep
When you are gone from me in sleep.