Joan Didion opened The White Album (1979) with what would become one of the most iconic lines in American literature: "We tell ourselves stories in order to live." Today, this phrase is deployed inspirationally, printed on T-shirts and posters, used as a battle cry for artists and writers. In truth, Didion was describing something much less rosy: our human tendency to manufacture delusions that might ward away our anxieties when society seems to...