“A physicist is just an atom's way of looking at itself.”

“Every great and deep difficulty bears in itself it’s own solution. It forces us to change our thinking in order to find it.”

“No, no, you're not thinking; you're just being logical.”

“There are some things so serious that you have to laugh at them.”

“Never express yourself more clearly than you are able to think”

“There are trivial truths and there are great truths. The opposite of a trivial truth is plainly false. The opposite of a great truth is also true.”

“Prediction is very difficult, especially about the future.”