'Til the infallibility of human judgements shall have been proved to me, I shall demand the abolition of the penalty of death.

Cruelty, very far from being a vice, is the first sentiment Nature injects in us all. The infant breaks his toy, bites his nurse's breast, strangles his canary long before he is able to reason; cruelty is stamped in animals, in whom, as I think I have said, Nature's laws are more emphatically to be read than in ourselves; cruelty exists amongst savages, so much nearer to Nature than civilized men are; absurd then to maintain cruelty is a consequence of depravity. . . . Cruelty is simply the energy in a man civilization has not yet altogether corrupted: therefore it is a virtue, not a vice.

I don't know what the heart is, not I: I only use the word to denote the mind's frailties.

They declaim against the passions without bothering to think that it is from their flame philosophy lights its torch.

Why do you complain of your fate when you could so easily change it?

It is only by enlarging the scope of one’s tastes and one’s fantasies, by sacrificing everything to pleasure, that the unfortunate individual called Man, thrown despite himself into this sad world, can succeed in gathering a few roses among life’s thorns

For mortal men there is but one hell, and that is the folly and wickedness and spite of his fellows; but once his life is over, there's an end to it: his annihilation is final and entire, of him nothing survives.