Plato, Laws 797a

ἀκούσατε δέ μου, προακηκοότες μὲν καὶ ἐν τοῖς πρόσθεν· ὅμως δὲ τό γε σφόδρα ἄτοπον καὶ ἄηθες διευλαβεῖσθαι δεῖ λέγοντα καὶ ἀκούοντα, καὶ δὴ καὶ νῦν. ἐρῶ μὲν γὰρ ἐγὼ λόγον οὐκ ἄφοβον εἰπεῖν, ὅμως δέ πῃ θαρρήσας οὐκ ἀποστήσομαι. τίνα δὴ τοῦτον, ὦ ξένε, λέγεις; φημὶ κατὰ πάσας πόλεις τὸ τῶν παιδιῶν γένος ἠγνοῆσθαι σύμπασιν ὅτι κυριώτατόν ἐστι περὶ θέσεως νόμων, ἢ μονίμους εἶναι τοὺς τεθέντας ἢ μή. ταχθὲν μὲν

Give ear to me now, albeit ye have already done so in the past. None the less, one must take great heed, now as before, both in the telling and in the hearing of a thing that is supremely strange and novel. To make the statement that I am going to make is an alarming task; yet I will summon up my courage, and not shrink from it. What is the statement you refer to, Stranger? I assert that there exists in every State a complete ignorance about children’s games—how that they are of decisive importance for legislation, as determining whether the laws enacted are to be permanent or not.