A passage from Cicero
Cicero, De Officiis I.153
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We should follow the counsel of nature, and nature has implanted in man a love of his fellow-men. Therefore, all men are united by a common bond.
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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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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It is a man's special privilege to love even those who wrong him.