Some things are up to you, and everything else isn't, sort your worries accordingly

Epictetus, a former slave who became a Stoic teacher, opened his handbook by dividing the world in two: your own judgments, desires, and actions are up to you; your body, reputation, and outcomes are not. He argued that nearly all human distress comes from treating the second category as if it were the first, grieving over a reputation you never controlled instead of the choice you actually made.

— Epictetus, Enchiridion (The Handbook) — c. 135 AD, compiled by his student Arrian