A passage from Marcus Aurelius
Marcus Aurelius, Meditations 4.21
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If any man has done wrong, the harm is his own. But perhaps he has not done wrong.
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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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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It is a man's special privilege to love even those who wrong him.