p. 368 "The concept of 'evil,' . . . doesn't fit easily into a modern scientific world view. Still, people seem to find it useful, and the reason is that it is metaphorically apt. There is indeed a force devoted to enticing us into various pleasures that are (or once were) in our genetic interests but do not bring long-term happiness to us and may bring great suffering to others. You could call that force the ghost of natural selection. More concretely, you could call it our genes (some of our genes, at least). If it will help to actually use the word evil, there's no reason not to."

and

p. 369 "In all these assaults on the senses there is a great wisdom -- not only about the addictiveness of pleasures but about their ephemerality. The essense of addiction, after all, is that pleasure tends to dissipate and leave the mind agitated, hungry for more. The idea that just one more dollar, one more dalliance, one more rung on the ladder will leave us feeling sated reflects a misunderstanding about human nature -- a misunderstanding, moreover, that is built into human nature; we are designed to feel that the next great goal will bring bliss, and the bliss is designed to evaporate shortly after we get there. Natural selection has a malicious sense of humor; it leads us along with a series of promises and then keeps saying 'Just kidding.' . . . Remarkably, we go our whole lives without ever really catching on."