“…and the wisdom to know the difference.”
The Serenity Prayer asks for it. Nobody grants it. Epictetus opened his handbook with the test:
Some things are up to us, while others are not up to us.
Encheiridion 1 · ἐφ’ ἡμῖν (eph’ hēmin) means “up to us” · tr. Oldfather (1928), who wrote “under our control”