Plato, Laws 679d

ἐμοὶ γοῦν δὴ καὶ τῷδε οὕτως ταῦτα συνδοκεῖ. οὐκοῦν εἴπωμεν ὅτι γενεαὶ διαβιοῦσαι πολλαὶ τοῦτον τὸν τρόπον τῶν πρὸ κατακλυσμοῦ γεγονότων καὶ τῶν νῦν ἀτεχνότεροι μὲν καὶ ἀμαθέστεροι πρός τε τὰς ἄλλας μέλλουσιν εἶναι τέχνας καὶ πρὸς τὰς πολεμικάς, ὅσαι τε πεζαὶ καὶ ὅσαι κατὰ θάλατταν γίγνονται τὰ νῦν, καὶ ὅσαι δὴ κατὰ πόλιν μόνον αὐτοῦ, δίκαι καὶ στάσεις λεγόμεναι, λόγοις

Certainly Megillus and I quite agree with what you say. And shall we not say that people living in this fashion for many generations were bound to be unskilled, as compared with either the antediluvians or the men of today, and ignorant of arts in general and especially of the arts of war as now practised by land and sea, including those warlike arts which, disguised under the names of law-suits and factions, are peculiar to cities, contrived as they are with every device of word and deed to inflict mutual hurt and injury;