If we couldn't laugh at ourselves, that would be the end of everything.

Prediction is very difficult, especially if it's about the future.

The best weapon of a dictatorship is secrecy, but the best weapon of a democracy should be the weapon of openness.

The opposite of a fact is falsehood, but the opposite of one profound truth may very well be another profound truth.

A person who wasn't outraged on first hearing about quantum theory didn't understand what had been said.

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

What is that we human beings ultimately depend on? We depend on our words. We are suspended in language. Our task is to communicate experience and ideas to others.