Sentence 13 of Three Character Classic

This sentence is part of Three Character Classic, written by Herbert Giles (1845-1935) .

If he does not learn while young, what will he be when old?
If jade is not polished, it cannot become a thing of use.
If a man does not learn, he cannot know his duty towards his neighbour.
Added by marcanuy.

Translations

The sentence has the following translations available.

Chinese

Source: 三字經 written by Wang Yinglin