Do not do to others that which angers you when they do it to you.
ἃ πάσχοντες ὑφ᾿ ἑτέρων ὀργίζεσθε, ταῦτα τοὺς ἄλλους μὴ ποιεῖτε.
Original text (Ancient Greek)
More quotes by Isocrates
Be gracious to all men, but choose the best to be your friends.
Rather let it be your object to bequeath to your children a stainless name than a large fortune.
It is the function of the ruler to use his best endeavours to make his subjects happier.
Be not content only to praise the virtuous, but imitate them too.
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An unsanctified temper is a fruitful source of error, and a mighty impediment to truth.
Attribution
Quote text and notes from Wikiquote: Isocrates (page history), available under CC BY-SA 4.0. Source quality and labels are our own summary of what Wikiquote records.