Each act of cruelty is eternally a part of the universe; nothing that happens later can make that act good rather than bad, or can confer perfection on the whole of which it is a part.

The pure mathematician, like the musician, is a free creator of his world of ordered beauty.

I did not, however, commit suicide, because I wished to know more of mathematics.

War does not determine who is right - only who is left.

The man who is unhappy will, as a rule, adopt an unhappy creed, while the man who is happy will adopt a happy creed; each may attribute his happiness or unhappiness to his beliefs, while the real causation is the other way round.

Without civic morality communities perish; without personal morality their survival has no value.

The problem with the wise is they are so filled with doubts while the dull are so certain.