When medieval historian Peter Jones found himself spiraling into depression while teaching at a frigid Siberian university with icicles sprouting from his eyelashes, he asked himself what a medieval sufferer would do—and discovered something shocking: the Middle Ages, for all its reputation as a dark and superstitious time, was actually the golden age of self-help. A medieval merchant consulting a priest about melancholia would receive diagnosis, confession, and penance based on the Seven Deadly Sins, a psychological framework that mapped the seven basic patterns of human thought long before modern psychiatry existed. What we dismiss today as a catalog of Thou Shall Nots was actually an intricate system for understanding behavior—so effective that Reid Hoffman, founder of LinkedIn, credited it for his social media success by mapping each sin to platforms: Tinder on Lust, Yelp on Gluttony, LinkedIn on Greed, Netflix on Sloth, Twitter on Anger, Facebook on Envy, and Instagram on Pride.

Today's guest is Peter Jones, author of Self-Help from the Middle Ages: What the Seven Deadly Sins Can Teach Us About Living. We discuss how fourth-century Egyptian monk Evagrius Ponticus formulated eight "wicked thoughts" to help monks identify psychological roots of temptation, why Pope Gregory the Great consolidated them into seven sins in the sixth century, and how the 1215 Lateran Council made yearly confession mandatory, transforming intellectual theology into practical psychology for the masses. Jones explains why sloth was considered the "ultimate danger"—a stagnation of the soul and refusal to fulfill one's purpose—and how medieval thinkers like Levi ben Abraham argued that avarice shackles the soul to material distractions while knowledge remains the only possession that cannot be stolen, making intellectual acquisitions the cure for greed.

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How Medieval Monks Used the 7 Deadly Sins to Map Human Behavior…and LinkedIn Weaponized them Against Us