If one studies too zealously, one easily loses his pants.

I know not with what weapons World War III will be fought, but World War IV will be fought with sticks and stones.

Truly novel inventions emerge only in one's youth. Later one becomes ever more experienced, famous-and foolish.

People will not disarm step by step; they will disarm at one blow or not at all.

I cannot conceive of a God who rewards and punishes his creatures, or has a will of the type of which we are conscious in ourselves. An individual who should survive his physical death is also beyond my comprehension, nor do I wish it otherwise; such notions are for the fears or absurd egoism of feeble souls.

Capitalism has brought with it progress, not merely in production but also in knowledge.

In the shadow of the atomic bomb it has become even more apparent that all men are, indeed, brothers.