Sweet exists by convention, bitter by convention, colour by convention; atoms and Void [alone] exist in reality. (trans. Freeman 1948), p. 92.
νόμωι (γάρ φησι) γλυκὺ καὶ νόμωι πικρόν, νόμωι θερμόν, νόμωι ψυχρόν, νόμωι χροιή, ἐτεῆι δὲ ἄτομα καὶ κενόν (Tetralogies of Thrasyllus, 9; Sext. Emp. adv. math. VII 135)
Original text (Ancient Greek)
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By convention sweet is sweet, bitter is bitter, hot is hot, cold is cold, color is color; but in truth there are only atoms and the void. (trans. Durant 1939), Ch. XVI, §II, p. 353; citing C. Bakewell, Sourcebook in Ancient Philosophy, New York, 1909, "Fragment O" (Diels), p. 60