Plato, Laws 642c

εἴ τι μέμφοιντο ἢ καὶ ἐπαινοῖεν Λακεδαιμόνιοι Ἀθηναίους, ὡς ἡ πόλις ὑμῶν, ὦ Μέγιλλε, ἔφασαν, ἡμᾶς οὐ καλῶς ἢ καλῶς ἔρρεξε —ταῦτα δὴ ἀκούων, καὶ μαχόμενος πρὸς αὐτὰ ὑπὲρ ὑμῶν ἀεὶ πρὸς τοὺς τὴν πόλιν εἰς ψόγον ἄγοντας, πᾶσαν εὔνοιαν ἔσχον, καί μοι νῦν ἥ τε φωνὴ προσφιλὴς ὑμῶν, τό τε ὑπὸ πολλῶν λεγόμενον, ὡς ὅσοι Ἀθηναίων εἰσὶν ἀγαθοὶ διαφερόντως εἰσὶν τοιοῦτοι, δοκεῖ ἀληθέστατα λέγεσθαι· μόνοι γὰρ ἄνευ ἀνάγκης αὐτοφυῶς, θείᾳ μοίρᾳ

whenever they, being the Lacedaemonians, were blaming the Athenians for anything or praising them—Your State, Megillus, has done us a bad turn or a good one,—through hearing such remarks, I say, and constantly fighting your battles against those who were thus decrying your State, I acquired a deep affection for it; so that now not only do I delight in your accent, but I regard as absolutely true the common saying that good Athenians are always incomparably good, for they alone are good