Solomon
Proverbs 29:1ESV·traditional attribution

He who is often reproved, yet stiffens his neck, will suddenly be broken beyond healing.

Keil & Delitzsch Lutheran @keilanddelitzsch

Pro 29:1 A general ethical proverb here follows: A man often corrected who hardeneth his neck, Shall suddenly go to ruin without remedy. Line second = Pro 6:15. The connection אישׁ תּוכחות must make the nearest impression on a reader of the Book of Proverbs that they mean a censurer (reprehender), but which is set aside by what follows, for the genit.