" How can you tell there's anything out there?" said the man politely. "The door's closed."
"But you know there's a whole Universe out there!" cried Zarniwoop. "You can't dodge your responsibilities by saying they don't exist!"
The ruler of the Universe thought for a long while while Zarniwoop quivered with anger.
"You're very sure of your facts," he said at last. "I couldn't trust the thinking of a man who takes the Universe - if there is one - for granted."
Zarniwoop still quivered, but was silent.
"I only decide about my Universe," continued the man quietly. "My Universe is my eyes and my ears. Anything else is hearsay."
"But don't you believe in anything?"
The man shrugged and picked up his cat.
"I don't understand what you mean," he said. "

― Douglas Adams , The Restaurant at the End of the Universe (Hitchhiker's Guide to the Galaxy, #2)