A passage from Marcus Aurelius
Marcus Aurelius, Meditations 4.28
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When a man is properly disciplined in self-respect and reverence, he will not be easily moved to indignation, and his aspect will not be querulous.
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.'