Theodore Roethke Quote

Is pain a promise? I was schooled in pain,
And found out what I could of all desire;
I weep for what I'm like when I'm alone
In the deep center of the voice and fire. I know the motion of the deepest stone.
Each one's himself, yet each one's everyone.

"The Sententious Man," ll. 31-36 - Words for the Wind (1958)