The value of achievement lies in the achieving.

To punish me for my contempt for authority, fate made me an authority myself.

You have to learn the rules of the game. And then you have to play better than anyone else.

How can it be that mathematics, being after all a product of human thought which is independent of experience, is so admirably appropriate to the objects of reality?

You can never solve a problem with the same kind of thinking that created the problem in the first place.

We scientists, whose tragic destination has been to help in making the methods of annihilation more gruesome and more effective, must consider it our solemn and transcendent duty to do all in our power in preventing these weapons from being used for the brutal purpose for which they were invented.

The restriction of knowledge to an elite group destroys the spirit of the society and leads to its intellectual impoverishment.