The emperor who wrote letters only to himself

Marcus Aurelius spent much of his reign far from Rome, in military camps along the Danube, fighting Germanic tribes in the Marcomannic Wars. A plague was sweeping the empire. His children died young. His most trusted general rebelled.

At night, he wrote. The notes, in Greek, were titled simply "To Himself." They were reminders, not lectures: be patient with difficult people; you will die soon, so act well now; the obstacle is the way.

He never published them. Somehow they survived, copied and recopied, until they became known as the Meditations — one of the most widely read books of philosophy in the world.

What makes the Meditations remarkable is their honesty. Here is a man with unlimited power, repeatedly scolding himself for anger, laziness and vanity. The same struggles, it turns out, that everyone has.

Marcus never solved them for good. He simply returned to the page each night and began again. That, perhaps, is the real lesson: wisdom is not a destination but a daily practice.