I can't think that it would be terrible of me to say - and it is occasionally true - that I need physics more than friends.

We know too much for one man to know too much.

Things which stimulate my curiosity are pretty far removed from the practical and therefore from classification.

'It worked.' (said after witnessing the first atomic detonation).

It is proper to the role of the scientist that he not merely find new truth and communicate it to his fellows, but that he teach, that he try to bring the most honest and intelligible account of new knowledge to all who will try to learn.

Today, it is not only that our kings do not know mathematics, but our philosophers do not know mathematics and - to go a step further - our mathematicians do not know mathematics.

We do not believe any group of men adequate enough or wise enough to operate without scrutiny or without criticism. We know that the only way to avoid error is to detect it, that the only way to detect it is to be free to inquire. We know that in secrecy error, undetected, will flourish and subvert.