Look not into the sun! Even the moon is too bright for your nocturnal eyes!

There are instances when we are like horses, we psychologists, and grow restless: we see our own shadow wavering up and down before us. A psychologist must look away from himself in order to see anything at all.

Insanity in individuals is something rare - but in groups, parties, nations and epochs, it is the rule.

I presume that you are compassionate: to be without pity means to be sick in body and spirit. But one should have spirit in abundance, so as to be permitted to be compassionate! For your pity is detrimental to you and to everyone.

It is an end with priests and gods, if man becomes scientific. Moral: science is the thing forbidden in itself - it alone is forbidden. Science is the first sin, the germ of all sin, original sin. This alones is mortality: Thou shalt not know.

truths are illusions of which one has forgotten that they are illusions, metaphors that have become worn-out and deprived of their sensuous force, coins that have lost their imprint and are now no longer seen as coins but as metal.

The Germans are like women, you can scarcely ever fathom their depths - they haven't any.