Plutarch, On the Education of Children 20
“Once I add a few more things, I will complete my proposals. Beyond all other things, it is necessary that fathers, by avoiding transgressions and doing everything that is required, offer themselves as a clear example to their children, so that when looking at their father’s life as if in a mirror they may turn away from shameful deeds and words.
Whoever makes the same mistakes as those for which they punish their sons become their own accusers under their sons’ names without realizing it . Men who live life poorly in every way do not possess the right to criticize their slaves, much less their sons. In addition, they could become their sons’ advisors and teachers of crime. For whenever old men behave shamefully, it is by necessity that their young are the most shameless.”
Βραχέα δὲ προσθεὶς ἔτι περιγράψω τὰς ὑποθήκας. πρὸ πάντων γὰρ δεῖ τοὺς πατέρας τῷ μηδὲν ἁμαρτάνειν ἀλλὰ πάνθ’ ἃ δεῖ πράττειν ἐναργὲς αὑτοὺς παράδειγμα τοῖς τέκνοις παρέχειν, ἵνα πρὸς τὸν τούτων βίον ὥσπερ κάτοπτρον ἀποβλέποντες ἀποτρέπωνται τῶν αἰσχρῶν ἔργων καὶ λόγων. ὡς οἵτινες τοῖς ἁμαρτάνουσιν υἱοῖς ἐπιτιμῶντες τοῖς αὐτοῖς ἁμαρτήμασι περιπίπτουσιν, ἐπὶ τῷ ἐκείνων ὀνόματι λανθάνουσιν ἑαυτῶν κατήγοροι γιγνόμενοι• τὸ δ’ ὅλον φαύλως ζῶντες οὐδὲ τοῖς δούλοις παρρησίαν ἄγουσιν ἐπιτιμᾶν, μή τί γε τοῖς υἱοῖς. χωρὶς δὲ τούτων γένοιντ’ ἂν αὐτοῖς τῶν ἀδικημάτων σύμβουλοι καὶ διδάσκαλοι. ὅπου γὰρ γέροντές εἰσιν ἀναίσχυντοι, ἐνταῦθ’ ἀνάγκη καὶ νέους ἀναιδεστάτους εἶναι.