"Two tadpoles were discussing the possibility of any kingdom above their own. One little tadpole said to the other, "I think I will stick my head above the water to see what the rest of the world looks like." The other tadpole answered: "Don't be stupid; don't try to tell me that there is anything else in the world besides water!"
Taken from Treasure in Clay: The Autobiography of Fulton J. Sheen, p. 262
A worthy book.