The refinement of morality increases together with the refinement of fear. Today the fear of disagreeable feelings in other people is almost the strongest of our own disagreeable feelings.

A vocation makes us unthinking; that is its greatest blessing. For it is a bulwark behind which we are permitted to withdraw whencommonplace doubts and cares assail us.

Mathematics is merely the means to a general and ultimate knowledge of man.

You highest men whom I have ever seen! This is my suspicion about you and my secret laughter: I guess that you would call my superman--a devil!

Everyone carries within himself an image of womanliness derived from his mother: it is this that determines whether, on the whole,he will revere women, or despise them, or remain generally indifferent to them.

When we are tired, we are attacked by ideas we conquered long ago.

There are two types of genius; one which above all begets and wants to beget, and another which prefers being fertilized and giving birth.