Plato, Laws 714b

ὦ Κλεινία, πότερον αὐτῷ πεισόμεθα ἢ πῶς δράσομεν. ἀνάγκη δήπου πείθεσθαι. ἐννοεῖς οὖν ὅτι νόμων εἴδη τινές φασιν εἶναι τοσαῦτα ὅσαπερ πολιτειῶν, πολιτειῶν δὲ ἄρτι διεληλύθαμεν ὅσα λέγουσιν οἱ πολλοί; μὴ δὴ φαύλου πέρι νομίσῃς εἶναι τὴν νῦν ἀμφισβήτησιν, περὶ δὲ τοῦ μεγίστου· τὸ γὰρ δίκαιον καὶ ἄδικον οἷ χρὴ βλέπειν, πάλιν ἡμῖν ἀμφισβητούμενον ἐλήλυθεν. οὔτε γὰρ πρὸς τὸν πόλεμον οὔτε πρὸς ἀρετὴν

no means of salvation. This, then, is the statement, Clinias, which we have to examine, to see whether we believe it, or what we are to do. We must, of course, believe it. Are you aware that, according to some, there are as many kinds of laws as there are kinds of constitutions? And how many constitutions are commonly recognized we have recently recounted. Please do not suppose that the problem now raised is one of small importance; rather it is of the highest importance. For we are again faced with the problem as to what ought to be the aim of justice and injustice. The assertion of the people I refer to is this,—