The Nuremberg Trial of the German war criminals was tacitly based on the recognition of the principle: criminal actions cannot be excused if committed on government orders; conscience supersedes the authority of the law of the state.

Nothing that I can do or say will change the structure of the universe. But maybe, by raising my voice, I can help the greatest of all causes — good will among men and peace on earth.

You see, wire telegraph is a kind of a very, very long cat. You pull his tail in New York and his head is meowing in Los Angeles. Do you understand this? And radio operates exactly the same way: you send signals here, they receive them there. The only difference is that there is no cat.

It's very depressing to live in a time where it's easier to break an atom than a prejudice.

Whoever is careless with the truth in small matters cannot be trusted in important affairs.

Play is the highest from of research.

This is a question too difficult for a mathematician. It should be asked of a philosopher"(when asked about completing his income tax form)