Realism is simply Romanticism that has lost its reason...that is its reason for existing.

I defy anybody to say what are the rights of a citizen, if they do not include the control of his own diet in relation to his own health.

[A pacifist is] the last and least excusable on the list of the enemies of society.

The problem of disbelieving in God is not that a man ends up believing nothing. Alas, it is much worse. He ends up believing anything.

Christianity satisfies suddenly and perfectly man's ancestral instinct for being the right way up; satisfies it supremely in this, that by its creed Joy becomes something gigantic, and Sadness something special and small.

The past is democratic, because it is a people. The future is despotic, because it is a caprice. Every man is alone in his prediction, just as each man is alone in a dream.

Men can construct a science with very few instruments, or with very plain instruments; but no one on earth could construct a science with unreliable instruments. A man might work out the whole of mathematics with a handful of pebbles, but not with a handful of clay which was always falling apart into new fragments, and falling together into new combinations. A man might measure heaven and earth with a reed, but not with a growing reed.