The abdomen is the reason why man does not readily take himself to be a god.

Is man God's biggest blunder, or is man's God?

An important species of pleasure, and therewith the source of morality, arises out of habit.

One will rarely err if extreme actions be ascribed to vanity, ordinary actions to habit, and mean actions to fear.

A woman does not want the truth; what is truth to women? From the beginning, nothing has been more alien, repugnant, and hostile to woman than the truth - her great art is the lie, her highest concern is mere appearance and beauty.

...the only psychologist from whom I have anything to learn.

no one talks more passionately about his rights than he who in the depths of his soul doubts whether he has any