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

When men have come to the edge of a precipice, it is the lover of life who has the spirit to leap backwards, and only the pessimist who continues to believe in progress.

As long as the vision of heaven is always changing, the vision of earth will be exactly the same. No ideal will remain long enough to be realized, or even partly realized. The modern young man will never change his environment; for he will always change his mind.

Think of all those ages through which men have had the courage to die, and then remember that we have actually fallen to talking about having the courage to live.

My brain and this world don't fit each other; and there's an end of it.

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

Progress is Providence without God. That is, it is a theory that everything has always perpetually gone right by accident. It is a sort of atheistic optimism, based on an everlasting coincidence far more miraculous than a miracle.