Plato, Laws 693a

ἤμυνεν τὴν ἐπιοῦσαν δουλείαν, σχεδὸν ἂν ἤδη πάντʼ ἦν μεμειγμένα τὰ τῶν Ἑλλήνων γένη ἐν ἀλλήλοις, καὶ βάρβαρα ἐν Ἕλλησι καὶ Ἑλληνικὰ ἐν βαρβάροις, καθάπερ ὧν Πέρσαι τυραννοῦσι τὰ νῦν διαπεφορημένα καὶ συμπεφορημένα κακῶς ἐσπαρμένα κατοικεῖται. ταῦτʼ, ὦ Κλεινία καὶ Μέγιλλε, ἔχομεν ἐπιτιμᾶν τοῖς τε πάλαι πολιτικοῖς λεγομένοις καὶ νομοθέταις καὶ τοῖς νῦν, ἵνα τὰς αἰτίας αὐτῶν ἀναζητοῦντες,

and Lacedaemonians, practically all the Greek races would have been confused together by now, and barbarians confused with Greeks and Greeks with barbarians,—just as the races under the Persian empire today are either scattered abroad or jumbled together and live in a miserable plight. Such, O Megillus and Clinias, are the charges we have to make against the so-called statesmen and lawgivers, both of the past and of the present, in order that, by investigating their causes, we may discover