I used to think my greatest challenge as a writer was identifying, in the most precise possible terms, how I feel. Most of the time, though, I know what I feel. This is palpable when I am stricken by an emotion I’ve lived through before. No matter how traumatic the sensation—the icy terror of being found cheating on a sixth grade reading quiz calling to mind the chilling shame three years earlier when my dad caught me illicitly scratching off a lottery ticket—there is comfort in believing that feelings are drawn from a massive, but ultimately finite, palette. Perhaps the…