Men erring on the side of deficiency as regards pleasures, and taking less than a proper amount of enjoyment in them, scarcely occur; such insensibility is not human. Indeed, even the lower animals discriminate in food, and like some kinds and not others; and if there be a creature that finds nothing pleasant, and sees no difference between one thing and another, it must be very far removed from humanity. As men of this type scarcely occur, we have no special name for them.