Physics is essentially an intuitive and concrete science. Mathematics is only a means for expressing the laws that govern phenomena.

For an idea which, at first, does not seem absurd, there is no hope.

There are two different conceptions about the nature of the universe: (1) the world as a unity dependent on humanity; (2) the world as a reality independent of the human factor.

Heroism on command, senseless violence, and all the loathsome nonsense that goes by the name of patriotism - how passionately I hate them!

My opinion about Miller's experiments is the following. ... Should the positive result be confirmed, then the special theory of relativity and with it the general theory of relativity, in its current form, would be invalid. Experimentum summus judex. Only the equivalence of inertia and gravitation would remain, however, they would have to lead to a significantly different theory.

It is really a puzzle what drives one to take one's work so devilishly seriously.

I have survived two wars, two wives and Hitler.