A passage from Marcus Aurelius
Marcus Aurelius, Meditations 4.24
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If thou wouldst be at rest, do little. But it is better to do necessary things, and as many as the reason of a social animal requires, and as it requires.
Related passages
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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.'
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Waste no more time arguing what a good man should be. Be one.
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Since it is possible that thou mayest depart from life this very moment, regulate every act and thought accordingly.