Plato, Laws 661c

καὶ τὸ ἀκούειν καὶ αἰσθάνεσθαι καὶ τὸ παράπαν ζῆν μέγιστον μὲν κακὸν τὸν σύμπαντα χρόνον ἀθάνατον ὄντα καὶ κεκτημένον πάντα τὰ λεγόμενα ἀγαθὰ πλὴν δικαιοσύνης τε καὶ ἀρετῆς ἁπάσης, ἔλαττον δέ, ἂν ὡς ὀλίγιστον ὁ τοιοῦτος χρόνον ἐπιζώῃ. ταῦτα δὴ λέγειν, οἶμαι, τοὺς παρʼ ὑμῖν ποιητάς, ἅπερ ἐγώ, πείσετε καὶ ἀναγκάσετε, καὶ ἔτι τούτοις ἑπομένους ῥυθμούς τε καὶ ἁρμονίας ἀποδιδόντας παιδεύειν οὕτω τοὺς νέους ἡμῶν. ἦ γάρ; ὁρᾶτε. ἐγὼ μὲν γὰρ λέγω

sensation and even of itself are very great evils for the man endowed with all the so-called goods, but lacking in justice and all virtue, if he is immortal forever, but a lesser evil for such a man if he survives but a short time. This, I imagine, is what you (like myself) will persuade or compel your poets to teach, and compel them also to educate your youth by furnishing them with rhythms and harmonies in consonance with this teaching. Am I not right? Just consider: