“If you put these three principles of design together, you get a pretty plausible explanation of the human predicament as diagnosed by the Buddha. Yes, as he said, pleasure is fleeting, and, yes, this leaves us recurrently dissatisfied. And the reason is that pleasure is designed by natural selection to evaporate so that the ensuing dissatisfaction will get us to pursue more pleasure. Natural selection doesn’t “want” us to be happy, after all; it just “wants” us to be productive, in its narrow sense of productive. And the way to make us productive is to make the anticipation of pleasure very strong but the pleasure itself not very long-lasting.”