Robert J. Oppenheimer

As long as men are free to ask what they must - free to say what they think - free to think what they will - freedom can never be lost and science can never regress.

The optimist thinks this is the best of all possible worlds. The pessimist fears it is true.

Any man whose errors take ten years to correct is quite a man. - speaking of Albert Einstein

I am become death, shatterer of worlds.