Said unto me: the following verses, at least as far as the 10th verse, are propounded as the words of David, that the name of so great a king and holy a prophet might add the more authority and efficacy to his counsels. And live, i.e. thou shalt live. It is a promise in the form of a command, as Proverbs 3:25.
Related Commentaries of Proverbs 4:4
Proverbs 4:4
4 He taught me also, and said unto me, Let thine heart retain my words: keep my commandments, and live.