You can find this in The Book of a Monastic Life in Rilke’s Book of Hours.
by Rainer Maria Rilke
You, God, who live next door–
If at times, through the long night, I trouble you
with my urgent knocking–
this is why: I hear you breathe so seldom.
I know you’re all alone in that room.
If you should be thirsty, there’s no one
to get you a glass of water.
I wait listening, always. Just give me a sign!
I’m right here.
As it happens, the wall between us
is very thin. Why couldn’t a cry
from one of us
break it down? It would crumble
it would barely make a sound.