The moralist now addresses the disciple, and so to the end of the chapter. If thine heart be wise; become wise by profiting by discipline, and having its natural folly (Proverbs 22:15) eradicated. My heart shall rejoice, even mine.
The pronoun is repeated for the sake of emphasis (as in Proverbs 22:19), the speaker thus declaring his supreme interest in the moral progress of his pupil.