"I have a great deal of difficulty with the idea of 'truth' in the philosophical sense."

"I asked him once, 'How do you tell when a mathematical argument is correct?' He said, 'If it's beautiful, it's correct.'"

"I'm smart enough to know that I'm dumb."

"When you are a scientist, you are a child. You are always asking 'Why?'"

"It doesn't matter how beautiful your theory is, it doesn't matter how smart you are. If it doesn't agree with experiment, it's wrong."