A quotation from Confucius:
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Zigong asked, Is there a single word that can guide a person’s conduct throughout life? The Master said, That would be reciprocity, wouldn’t it? What you do not want others to do to you, do not do to others.
[子貢問曰、有一言、而可以終身行之者乎。子曰、其恕乎、己所不欲、勿施於人。]
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Full quote, sourcing, notes:
https://wist.info/confucius/12270/