A passage from Epictetus
Epictetus, Discourses III.16
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When you see a person weeping in sorrow, either when a child goes abroad or when he is dead, or when the man has lost his property, take care that the appearance does not hurry you away with it. But immediately make the distinction within yourself, and say, 'It is not the thing that distresses this man, but his judgment about it.'
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.