Diogenes Laertius 5.19 (tr. R.D. Hicks, on Aristotle):
Being asked how the educated differ from the uneducated, "As much," he said, "as the living from the dead." He used to declare education to be an ornament in prosperity and a refuge in adversity. Teachers who educated children deserved, he said, more honour than parents who merely gave them birth; for bare life is furnished by the one, the other ensures a good life.Jan Steen, A School for Boys and Girls
ἐρωτηθεὶς τίνι διαφέρουσιν οἱ πεπαιδευμένοι τῶν ἀπαιδεύτων, "ὅσῳ," εἶπεν, "οἱ ζῶντες τῶν τεθνεώτων." τὴν παιδείαν ἔλεγεν ἐν μὲν ταῖς εὐτυχίαις εἶναι κόσμον, ἐν δὲ ταῖς ἀτυχίαις καταφυγήν. τῶν γονέων τοὺς παιδεύσαντας ἐντιμοτέρους εἶναι τῶν μόνον γεννησάντων· τοὺς μὲν γὰρ τὸ ζῆν, τοὺς δὲ τὸ καλῶς ζῆν παρασχέσθαι.