Two Pithy Poems about Existence

(One I have liked since high school, and have been feeling more as I've gotten older; the other discovered in reading a sample translation once, much enjoyed, and never forgotten.)

A Man Said to the Universe
by Stephen Crane

A man said to the universe:
"Sir, I exist!"
"However," replied the universe,
"The fact has not created in me
A sense of obligation."

by Polleke
(a character in Guus Kuijer's Polleke series)

When I see a cow,
Then I know that God exists.
But if I say so to the cow,
She starts to moo.