Plato, Laws 653d

δὲ οἰκτίραντες τὸ τῶν ἀνθρώπων ἐπίπονον πεφυκὸς γένος, ἀναπαύλας τε αὐτοῖς τῶν πόνων ἐτάξαντο τὰς τῶν ἑορτῶν ἀμοιβὰς τοῖς θεοῖς, καὶ μούσας Ἀπόλλωνά τε μουσηγέτην καὶ Διόνυσον συνεορταστὰς ἔδοσαν, ἵνʼ ἐπανορθῶνται, τάς τε τροφὰς γενομένας ἐν ταῖς ἑορταῖς μετὰ θεῶν. ὁρᾶν ἃ χρὴ πότερον ἀληθὴς ἡμῖν κατὰ φύσιν ὁ λόγος ὑμνεῖται τὰ νῦν, ἢ πῶς. φησὶν δὲ τὸ νέον ἅπαν ὡς ἔπος εἰπεῖν τοῖς τε σώμασι καὶ ταῖς φωναῖς ἡσυχίαν ἄγειν οὐ δύνασθαι,

in the course of men’s lives; so the gods, in pity for the human race thus born to misery, have ordained the feasts of thanksgiving as periods of respite from their troubles; and they have granted them as companions in their feasts the Muses and Apollo the master of music, and Dionysus, that they may at least set right again their modes of discipline by associating in their feasts with gods. We must consider, then, whether the account that is harped on nowadays is true to nature? What it says is that, almost without exception, every young creature is able of keeping either its body or its tongue quiet,