All men whilst they are awake are in one common world; but each of them, when he is asleep, is in a world of his own.

Heraclitus

Quoted in Moralia, by Plutarch

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Citation

Plutarch. "Περὶ δεισιδαιμονίας [On Superstition]." Moralia [Ἠθικά]. c. 100 AD.