Happiness and freedom begin with a clear understanding of one principle: Some things are within our control, and some things are not.

τῶν ὄντων τὰ μέν ἐστιν ἐφ᾽ ἡμῖν, τὰ δὲ οὐκ ἐφ᾽ ἡμῖν.

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Original Citation

Epictetus. Ἐγχειρίδιον Ἐπικτήτου, Enkheirídion Epiktḗtou [Enchiridion of Epictetus]. c. 125 CE, ch. 1.

Current Citation

Epictetus. Enchiridion, translated by George Long. Dover Publications, 2004, ch. 1.