"But I don't want to go among mad people," Alice remarked. "Oh, you can't help that," said the Cat: "we're all mad here. I'm mad. You're mad." "How do you know I'm mad?" said Alice. "You must be," said the Cat, "or you wouldn't have come here." (Alice's Adventures in Wonderland, Chapter 6) Quotes
It's no use going back to yesterday because I was a different person then. Alice in Wonderland.