“But I believe that the grand unifying theory that explains the paradox of tragedy is (like most such theories) deceptively simple: We don’t actually welcome tragedy per se. What we like are sad and beautiful things—the bitter together with the sweet. We don’t thrill to lists of sad words, for example, or slide shows of sad faces (researchers have actually tested this). What we love is elegiac poetry, seaside cities shrouded in fog, spires reaching through the clouds. In other words: We like art forms that express our longing for union, and for a more perfect and beautiful world. When we feel strangely thrilled by the sorrow of “Moonlight Sonata,” it’s the yearning for love that we’re experiencing—fragile, fleeting, evanescent, precious, transcendent love. The idea of longing as a sacred and generative force seems very odd in our culture of normative sunshine. But it’s traveled the world for centuries, under many different names, taking many different forms. Writers and artists, mystics and philosophers, have long tried to give voice to it. García Lorca called it the “mysterious power which everyone senses and no philosopher explains.”