The importance of a problem should not be judged by the number of pages devoted to it.

It may affront the military-minded person to suggest a regime that does not maintain any military secrets.

God may be subtle, but he isn't plain mean.

The more one chases the quanta, the better they hide themselves.

You see, wire telegraph is a kind of a very, very long cat. You pull his tail in New York and his head is meowing in Los Angeles. Do you understand this? And radio operates exactly the same way: you send signals here, they receive them there. The only difference is that there is no cat.

A human being is a part of the whole called by us universe; a part limited in time and space. He experiences himself, his thoughts, and his feelings as something separate from the rest - a kind of optical delusion of consciousness.

Conviction is a good motive, but a bad judge.