חֲנֹ֣ךְ לַ֭נַּעַר עַל־פִּ֣י דַרְכּ֑וֹ גַּ֥ם כִּֽי־יַ֝זְקִ֗ין לֹֽא־יָס֥וּר מִמֶּֽנָּה׃
要依照孩童的道路教養他，即使他年老了，也不會偏離。
Rashi
Train a child According to what you teach a child and train him in matters, either for good or bad, even when he grows old, he will not turn away from it.
Metzudat David
Start to accustom the boy in his [early] years to the service of God through wisdom in things small and big; once he is accustomed to serving God well, when he grows old he will not stray [from the path] because his deeds will be enlightened.