A country cannot simultaneously prepare and prevent war. I know not with what weapons World War III will be fought, but World War IV will be fought with sticks and stones. The distinctions separating the social classes are false; in the last analysis they rest on force.

If the moon, in the act of completing its eternal way around the earth, were gifted with self-consciousness, it would feel thoroughly convinced that it was traveling its way of its own accord on the strength of a resolution taken once and for all. So would a Being, endowed with higher insight and more perfect intelligence, watching man and his doings, smile about man's illusion that he was acting according to his own free will.

If you want to live a happy life, tie it to a goal, not to people or objects.

There are two ways to live: you can live as if nothing is a miracle; you can live as if everything is a miracle.

The health of society thus depends quite as much on the independence of the individuals composing it as on their close political cohesion.

God does not care about our mathematical difficulties. He integrates empirically.

The question that drives me hazy is whether it is I or others who is crazy.