Some things are within our power, while others are not.
Τῶν ὄντων τὰ μέν ἐστιν ἐφ᾽ ἡμῖν, τὰ δὲ οὐκ ἐφ᾽ ἡμῖν.
Philosophers
Epictetus
Epictetus (c. 50-135 AD), born a slave in Phrygia, never wrote a word. His Discourses and Enchiridion, recorded by Arrian, are the most widely read Stoic texts and a direct ancestor of cognitive behavioral therapy.
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Source: 提要（エンケイリディオン）第1章Verified