Epictetus' Discourses 3.6.2:
The good person is invincible because he never engages in any contest in which he is not superior. "If you want my land, take it; take my servants, take my public position, take my poor body. But you won't cause my desires to fail to attain their end, or my aversions to fall into what they want to avoid." This is the only contest that he enters into, the one that is concerned with things that lie within the sphere of choice; so how can he be anything other than invincible?

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