Men should learn to live with the same seriousness with which children play.

Man... cannot learn to forget, but hangs on the past: however far or fast he runs, that chain runs with him.

A very popular error: having the courage of one's convictions; rather it is a matter of having the courage for an attack on one's convictions.

Christianity is a metaphysics of the hangman.

Everyone who has ever built anywhere a "new heaven" first found the power thereto in his own hell.

I am opposed to socialism because it dreams ingenuously of good, truth, beauty, and equal rights.

If you have an enemy, do not requite him evil with good, for that would put him to shame. Rather prove that he did you some good.