Marcus Aurelius spent years as the most powerful man in the world — and kept a private journal reminding himself that he was mostly wrong about things. That's not false modesty; it's a deliberate cognitive practice. The Stoics called it *reservatio* — the mental habit of holding your plans loosely, expecting friction, and treating obstacles as information rather than betrayal. What's interesting is that modern decision theorist Gary Klein, studying firefighters and chess masters, found something structurally similar: experts don't succeed by having better predictions, they succeed by running faster mental simulations and updating sooner when reality pushes back. The Stoic and the decision theorist are pointing at the same thing — rigidity is the real enemy, not uncertainty. Today, when a plan goes sideways, try treating it as data arriving on schedule rather than a disruption to resent.

When your last significant plan fell apart, did you update your model of the situation — or did you mostly try harder to make the original plan work?

Drawing from Stoicism / Decision Theory — Marcus Aurelius & Gary Klein