A passage from Epictetus
Epictetus, Discourses IV.8
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The wise man is neither raised up by prosperity nor cast down by adversity. He is the same in all fortunes, because he has made virtue his only good.
Related passages
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Begin the morning by saying to thyself, I shall meet with the busy-body, the ungrateful, arrogant, deceitful, envious, unsocial.
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At dawn, when you have trouble getting out of bed, tell yourself: 'I have to go to work — as a human being.'
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Take care not to be Caesarified, or dyed with purple; for it does happen. Keep thyself then simple, good, pure, serious, free from affectation.