Even a child is known by his doings; young children discover their inclinations or dispositions even by their childish speeches and carriages, as not having yet learnt the art of dissembling. Whether his work be pure; or rather, will be pure; for it is not expressed in the Hebrew, and therefore may be either way supplied. The sense is, The future disposition and conversation of a man may very probably be conjectured from his childish manners.
Related Commentaries of Proverbs 20:11
Proverbs 20:11
11 Even a child is known by his doings, whether his work be pure, and whether it be right.