If the objects who serve us feel ecstacy, they are much more often concerned with themselves than with us, and our own enjoyment is consequently impaired. The idea of seeing another person experience the same pleasure reduces one to a kind of equality which spoils the unutterable charms that come from despotism.
Marquis de SadeIf Nature denies eternity to beings, it follows that their destruction is one of her laws. Now, once we observe that destruction is so useful to her that she absolutely cannot dispense with it from this moment onward the idea of annihilation which we attach to death ceases to be real what we call the end of the living animal is no longer a true finish, but a simple transformation, a transmutation of matter. According to these irrefutable principles, death is hence no more than a change of form, an imperceptible passage from one existence into another.
Marquis de SadeConsider the problem from the point of view of evil, evil being almost always pleasure's true and major charm; considered thus, the crime must appear greater when perpetrated upon a being of your identical sort than when inflicted upon one which is not, and this once established, the delight automatically doubles.
Marquis de Sade