Certain souls seem hard because they are capable of strong feelings, and they sometimes go to rather extreme lengths; their apparent unconcern and cruelty are but ways, known only to themselves, of feeling more strongly than others.

Evil is... a moral entity and not a created one, an eternal and not a perishable entity: it existed before the world; it constituted the monstrous, the execrable being who was also to fashion such a hideous world. It will hence exist after the creatures which people this world

The mechanism that directs government cannot be virtuous, because it is impossible to thwart every crime, to protect oneself from every criminal without being criminal too; that which directs corrupt mankind must be corrupt itself; and it will never be by means of virtue, virtue being inert and passive, that you will maintain control over vice, which is ever active: the governor must be more energetic than the governed.

Lust is to the other passions what the nervous fluid is to life; it supports them all, lends strength to them all ambition, cruelty, avarice, revenge, are all founded on lust.

My manner of thinking, so you say, cannot be approved. Do you suppose I care? A poor fool indeed is he who adopts a manner of thinking to suit other people! My manner of thinking stems straight from my considered reflections; it holds with my existence, with the way I am made. It is not in my power to alter it; and were it, I'd not do so.

Virtue can procure only an imaginary happiness; true felicity lies only in the senses, and virtue gratifies none of them.

It is not the opinions or the vices of private individuals that are harmful to the State, but rather the behavior of public figures.