No kind of sensation is keener and more active than that of pain its impressions are unmistakable.

In order to know virtue, we must first acquaint ourselves with vice.

Now I beg of you to tell me whether I must love a human being simply because he exists or resembles me and whether for those reasons alone I must suddenly prefer him to myself?

The degradation which characterizes the state into which you plunge him by punishing him pleases, amuses, and delights him. Deep down he enjoys having gone so far as to deserve being treated in such a way.

Lust's passion will be served; it demands, it militates, it tyrannizes.

The man who alters his way of thinking to suit others is a fool.

Consider 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.