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"Do not do to others what would anger you if done to you by others."

Isocrates (436-338 BCE), in Nicocles, 6

"It is impossible to live a pleasant life without living wisely and well and justly (agreeing 'neither to harm nor be harmed'). And it is impossible to live wisely and well and justly without living a pleasant life."

Epicurus (~300 BC)

"Avoid doing what you would blame others for doing."

Thales, Diogenes Laertius vol. 1 (7th century BC)

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