Sort what is up to you

Epictetus’ first and central move: divide everything into what is in your power and what is not.

Why it works

The Enchiridion opens here because everything else depends on it: "some things are up to us and some are not". Suffering, Epictetus argues, comes from wanting power over what we don’t have it over. Sorting forces your effort onto the only domain you actually govern — your judgments, desires, and actions — and lets you stop pouring energy into outcomes, other people, and the past.

How to do it

1. State what’s troubling you, then split it: my judgments/choices/effort vs. outcomes/others/circumstances.
2. Commit fully to the first set; deliberately let go of the second.
3. When upset returns, check which side of the line you slipped back onto.

Evidence

This control/appraisal distinction is the conceptual seed of cognitive behavioral therapy, whose founders explicitly credited the Stoics. CBT’s reappraisal methods are among the best-supported tools in clinical psychology. (clinical)

The clinical evidence is for modern CBT reappraisal, not for the ancient maxim verbatim. The lineage is real; the specific framing is philosophical.

Common mistake

Filing outcomes you influence (a result, a relationship, your reputation) under "up to me", then breaking when they don’t comply. Only your effort and judgment are fully yours.