Plato, Epinomis 979c

μὲν ἄλλα ἐπιτηδεύματα πάντα οὐ σφόδρα χαλεπὰ εἶναι, τὸ δὲ τίνα τρόπον χρὴ γίγνεσθαι χρηστοὺς ἀνθρώπους παγχάλεπον. καὶ τὰ μὲν ἄλλα αὖ πάντα κτᾶσθαι χρηστά, τὸ λεγόμενόν , καὶ δυνατὸν καὶ οὐ χαλεπόν, οὐσίαν τε ὅσην δεῖ καὶ μὴ δεῖ, καὶ σῶμα οἷόν τε δεῖ καὶ μή· καὶ ψυχὴν ὅτι μὲν ἀγαθὴν δεῖ, συγχωρεῖ πᾶς παντί, τὸ δʼ ὅντινα τρόπον ἀγαθήν, ὅτι μὲν αὖ δικαίαν καὶ σώφρονα καὶ ἀνδρείαν, καὶ ταῦτα, ὅτι δὲ σοφήν, φησὶ μὲν πᾶς δεῖν, ἥντινα δὲ σοφίαν, ὡς ἄρτι

are not very difficult, but that this of learning in what way we should become good men is one of the utmost difficulty. Everything else, again, that is good, as they say, is both possible and not difficult to acquire, and the amount of property that is wanted or not wanted, and the kind of body that is wanted or not: everyone agrees that a good soul is wanted, and agrees, moreover, as to the manner of its goodness, that for this again it must be just and temperate and brave; but whereas everyone says it must be wise, no one any longer agrees at all with anyone else, in most cases—we have just now