A passage from Epictetus
Epictetus, Enchiridion 43
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Everything has two handles, the one by which it may be borne, the other by which it cannot. If your brother acts unjustly, do not lay hold on the action by the handle of his injustice... but by the opposite — that he is your brother.
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.