The release of atomic energy has not created a new problem. It has merely made more urgent the necessity of solving an existing one.

For every one billion particles of antimatter there were one billion and one particles of matter. And when the mutual annihilation was complete, one billionth remained - and that's our present universe.

Make everything as simple as possible, but not simpler.

I became more and more convinced that even nature could be understood as a relatively simple mathematical structure.

Only a monomaniac gets anything done.

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.

I should very much like to remain in the darkness of not having been analyzed.