We mistakenly imagine we want “happiness,” which we tend to picture in vague, soft-focus terms, when what we really crave is the harderedged quality of intensity. We’ve all known (or been) people who returned again and again to relationships that seemed to make them miserable. Quite a few soldiers can’t get used to the lowered stakes of civilian life, and reenlist. We want to be hurt, astonished, reminded we’re alive.

