Plato, Hippias Major, Hippias Minor, Ion, Menexenus, Cleitophon, Timaeus, Critias, Minos, Epinomis, Ἱππίασ μειζών 71:

καίτοι ἐγὼ αὐτὸν ἠρώτων οὕτωσ ὥσπερ σὺ ἐμέ, ὃ πᾶσι καλὸν καὶ ἀεί ἐστι. πῶσ οὖν φῄσ; οὐκ ἀχθέσῃ, ἂν εἴπω ταῦτα; εὖ γ’ οὖν οἶδα, ὦ Σώκρατεσ, ὅτι πᾶσι καλὸν τοῦτ’ ἐστίν, ὃ ἐγὼ εἶπον, καὶ δόξει. "ἦ καὶ ἔσται; φήσει· "ἀεὶ γάρ που τό γε καλὸν καλόν. " πάνυ γε. "οὐκοῦν καὶ ἦν; φήσει. καὶ ἦν. "ἦ καὶ τῷ Ἀχιλλεῖ," φήσει, "ὁ ξένοσ ὁ Ἠλεῖοσ ἔφη καλὸν εἶναι ὑστέρῳ τῶν προγόνων ταφῆναι, καὶ τῷ πάππῳ αὐτοῦ Αἰακῷ, καὶ τοῖσ ἄλλοισ ὅσοι ἐκ θεῶν γεγόνασι, καὶ αὐτοῖσ τοῖσ θεοῖσ;