Any power must be an enemy of mankind which enslaves the individual by power and by force, whether it arises under the Fascist or the Communist flag. All that is valuable in human society depends upon the opportunity for development accorded to the individual.

Only two things are infinite, the universe and human stupidity, and I'm not sure about the former.

In the matter of physics, the first lessons should contain nothing but what is experimental and interesting to see. A pretty experiment is in itself often more valuable than twenty formulae extracted from our minds.

[Freud's] sense of reality is less clouded by wishful thinking than is the case with other people and [he combines] the qualities of critical judgment, earnestness and responsibility.

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

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

The legs are the wheels of creativity.