There is no more lively sensation than that of pain; its impressions are certain and dependable, they never deceive as may those of the pleasure women perpetually feign and almost never experience.

All universal moral principles are idle fancies.

What I should like to find is a crime the effects of which would be perpetual, even when I myself do not act, so that there would not be a single moment of my life even when I were asleep, when I was not the cause of some chaos, a chaos of such proportions that it would provoke a general corruption or a distubance so formal that even after my death its effects would still be felt.

The mirror sees the man as beautiful, the mirror loves the man; another mirror sees the man as frightful and hates him; and it is always the same being who produces the impressions.

Any punishment that does not correct, that can merely rouse rebellion in whoever has to endure it, is a piece of gratuitous infamy which makes those who impose it more guilty in the eyes of humanity, good sense and reason, nay a hundred times more guilty than the victim on whom the punishment is inflicted.

Any enjoyment is weakened when shared.

Every principle is a judgment, every judgment the outcome of experience, and experience is only acquired by the exercise of the senses; whence it follows that religious principles bear upon nothing whatever and are not in the slightest innate. Ignorance and fear, you will repeat to them, ignorance and fear - those are the twin bases of every religion.