A man of genius can hardly be sociable, for what dialogues could indeed be so intelligent and entertaining as his own monologues?

This world could not have been the work of an all-loving being, but that of a devil, who had brought creatures into existence in order to delight in the sight of their sufferings.

Hatred is an affair of the heart; contempt that of the head.

Intellect is invisible to the man who has none.

Men are by nature merely indifferent to one another; but women are by nature enemies.

Animals learn death first at the moment of death;...man approaches death with the knowledge it is closer every hour, and this creates a feeling of uncertainty over his life, even for him who forgets in the business of life that annihilation is awaiting him. It is for this reason chiefly that we have philosophy and religion.

A high degree of intellect tends to make a man unsocial.