How do we heal the heart? As a historian of religion, I often return to the Gnostic Gospels, an astonishing cache of more than fifty sacred texts, discovered in Egypt, in 1945. Many of them speak to this question: How do we gain the courage to overcome grief and despair? In one story, Jesus’s disciples, after his death, meet a doctor who calls himself a “physician of souls”—the literal translation of “psychiatrist”—who turns out to be Jesus himself.