It is certainly true that principles cannot be more securely founded than on experience and consciously clear thinking.

My political ideal is democracy. Let every man be respected as an individual and no man idolized.

It's very depressing to live in a time where it's easier to break an atom than a prejudice.

Regarding sex education: no secrets!

The stakes are immense, the task colossal, the time is short. But we may hope - we must hope - that man's own creation, man's own genius, will not destroy him.

Formal symbolic representation of qualitative entities is doomed to its rightful place of minor significance in a world where flowers and beautiful women abound.

I have never obtained any ethical values from my scientific work.