A passage from Cicero
Cicero, Tusculan Disputations IV.30
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Anger is a brief madness. It takes away the judgment and makes a man the enemy of his best friends. The philosopher must therefore extirpate 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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At dawn, when you have trouble getting out of bed, tell yourself: 'I have to go to work — as a human being.'