Three great forces rule the world: stupidity, fear and greed.

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

If at first the idea is not absurd, then there is no hope for it.

What separates me from most so-called atheists is a feeling of utter humility toward the unattainable secrets of the harmony of the cosmos.

It is easier to denature plutonium than to denature the evil spirit of man.

It is difficult to say what truth is, but sometimes it is so easy to recognize a falsehood.

There is no scientific antidote, only education. You've got to change the way people think. I am not interested in disarmament talks between nations . . . What I want to do is to disarm the mind. After that, everything else will automatically follow. The ultimate weapon for such mental disarmament is international education.