A passage from Epictetus
Epictetus, Discourses IV.10
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The first business of the philosopher is to test the appearances and to distinguish between them. What is good? What is evil? What is indifferent? Unless you know these, you cannot live well.
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Take away thy opinion, and then there is taken away the complaint, 'I have been harmed.' Take away the complaint, and the harm is taken away.
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