A passage from Marcus Aurelius
Marcus Aurelius, Meditations 10.11
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Acquire the contemplative way of seeing how all things change into one another, and constantly attend to it, and exercise thyself about this part of philosophy. For nothing is so much adapted to produce magnanimity.
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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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Take care not to be Caesarified, or dyed with purple; for it does happen. Keep thyself then simple, good, pure, serious, free from affectation.