"The price of doing science is the necessity of not being a know-it-all."

"The first principle of science is that you must not fool yourself and you are the easiest person to fool."

"I just did a crazy guy. You are a crazy guy. You made a deal."

"It doesn't seem to me that this fantastically marvelous universe, this tremendous range of time and space and different kinds of animals, and all the different planets, and all these atoms with all th…"

"I don't like to be called 'Professor Feynman.' I like to be called 'Dick.'"