This is a poem found in The Book of a Monastic Life from Rilke’s Book of Hours.
by Rainer Maria Rilke
I love the dark hours of my being.
My mind deepens into them.
There I can find, as in old letters,
the days of my life, already lived,
and held like a legend, and understood.
Then the knowing comes: I can open
to another life that’s wide and timeless.
So I am sometimes like a tree
rustling over a gravesite
and making real the dream
of the one its living roots
a dream once lost
among sorrows and songs.
You can find this in Rilke’s Book of Hours.