“Stop telling God what to do with his dice.”

“Every sentence I utter must be understood not as an affirmation, but as a question.[A caution he gives his students, to be wary of dogmatism.]”

“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.”

“An expert is a person who has made all the mistakes that can be made in a very narrow field.”