The species with eyes appears suddenly, capriciously as it were, and it is this species which changes the environment by creating its visible aspect. The eye does not come into being because it is needed. Just the contrary; because the eye appears it can henceforth be applied as a serviceable instrument. Each species builds up its stock of useful habits by selecting among, and taking advantage of, the innumerable useless actions which a living being performs out of sheer exuberance. History as a System

In revenge and in love woman is more barbaric than man is. Beyond Good and Evil

Frequent and violent temptations were a proof that the citadel of the soul had not fallen and that the devil raged to make it fall. A Portrait of the Artist as a Young Man

The awful thing is that beauty is mysterious as well as terrible. God and the devil are fighting there and the battlefield is the heart of man. The Karamazov Brothers