His [Erwin Schrödinger's] private life seemed strange to bourgeois people like ourselves. But all this does not matter. He was a most lovable person, independent, amusing, temperamental, kind and generous, and he had a most perfect and efficient brain.

I have tried to read philosophers of all ages and have found many illuminating ideas but no steady progress toward deeper knowledge and understanding. Science, however, gives me the feeling of steady progress: I am convinced that theoretical physics is actual philosophy. It has revolutionized fundamental concepts, e.g., about space and time (relativity), about causality (quantum theory), and about substance and matter (atomistics), and it has taught us new methods of thinking (complementarity) which are applicable far beyond physics.

No language which lends itself to visualizability can describe quantum jumps.

We need to make a world in which fewer children are born, and in which we take better care of them.

All attempts to adapt our ethical code to our situation in the technological age have failed.

Those who say that the study of science makes a man an atheist, must be rather silly people.

The belief in a single truth is the root cause for all evil in the world.