Sirach (Ecclesiasticus) 30:11

μὴ δῷς αὐτῷ ἐξουσία ἐν νεότητι· θλάσον τὰς πλευρὰς αὐτοῦ, ὡς ἔστι νήπιος, μήποτε σκληρυνθεὶς ἀπειθήσῃ σοι. [καὶ μὴ παρίδῃς τὰς ἀγνοίας αὐτοῦ.

King James Version (KJV)

Give him no liberty in his youth, and wink not at his follies.