A passage from Marcus Aurelius
Marcus Aurelius, Meditations 4.18
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How much trouble he avoids who does not look to see what his neighbour says or does or thinks, but only to what he does himself, that it may be just and pure.
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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Take care not to be Caesarified, or dyed with purple; for it does happen. Keep thyself then simple, good, pure, serious, free from affectation.