Secrecy, once accepted, becomes an addiction.

There's no system foolproof enough to defeat a sufficiently great fool.

I tried to contribute to the defeat of the Soviets. If I contributed 1%, it is 1% of something enormous.

If not for me, the H-bomb would have been developed in Russia first. In the U.S., we'd now be speaking Russian.

Physics is, hopefully, simple. Physicists are not.

The best weapon of a dictatorship is secrecy; the best weapon of a democracy is openness.

The scientist is not responsible for the laws of nature. It is his job to find out how these laws operate. It is the scientist's job to find the ways in which these laws can serve the human will. However, it is not the scientist's job to determine whether a hydrogen bomb should be constructed, whether it should be used, or how it should be used. This responsibility rests with the American people and with their chosen representatives.