Young Mary

I know not all of that which I contain.
I'm small; I'm young; I fear the pain.
All is surprise: I am to be a mother.
That Holy Thing within me
and no other
is Heaven's King whose lovely
Love will reign.
My pain, his gaining my eternal gain
my fragile body holds Creation's Light.
its smallness shelters God's unbounded might.
The angel came and gave,
did not explain,
I know not all of that which I contain.

from The Ordering of Love, The new and collected poems of Madeleine L'Engle
p. 236 (Art by He Qi)