Bede

He will die because he lacked discipline, etc. Because he had disputed much about adulterers or heretics, as is his custom, he shows in the close of his narrative what the end of such people is; that is, they tend towards eternal death, who have hated the discipline of life. He calls it the multitude of folly, when heretics consider themselves wiser than the holy Fathers, or when the wicked, doing the works of darkness, either think the Lord does not see these things or believe they can easily endure His wrath.

Commentary on Proverbs ↗