Plato, Laws 702b

πῶς ἄν τις βέλτιστα τὸν αὑτοῦ βίον διαγάγοι· εἰ δὲ δή τι πεποιήκαμεν προὔργου, τίς ποτʼ ἂν ἔλεγχος γίγνοιτο ἡμῖν πρὸς ἡμᾶς αὐτοὺς λεχθείς, ὦ Μέγιλλέ τε καὶ Κλεινία; ἐγώ τινα, ὦ ξένε, μοι δοκῶ κατανοεῖν. ἔοικεν κατὰ τύχην τινὰ ἡμῖν τὰ τῶν λόγων τούτων πάντων ὧν διεξήλθομεν γεγονέναι· σχεδὸν γὰρ εἰς χρείαν αὐτῶν ἔγωγʼ ἐλήλυθα τὰ νῦν, καὶ κατά τινα αὖ καιρὸν σύ τε παραγέγονας ἅμα καὶ

a State might be managed, and how best the individual citizen might pass his life. But as to the value of our conclusions, what test can we apply in conversing among ourselves, O Megillus and Clinias? I think, Stranger, that I can perceive one. It is a piece of good luck for me that we have dealt with all these matters in our discourse. For I myself have now come nearly to the point when I shall need them, and my meeting with you and Megillus here was quite opportune. I will make no secret to you of what has befallen me;