“Do you see a man wise in his own eyes? There is more hope for a fool than for him” (Proverbs 26:12).
Given the disgusting and detestable portrait Solomon paints of fools at the beginning of this chapter (vv. 1, 3-11), it would be easy to conclude that choosing to live as a fool is the worst lifestyle possible. That would be an inaccurate deduction. According to this proverb, there is at least one lifestyle more gruesome and worse than the life lived by a fool.
Living in complete disregard to God and the wisdom He imparts in His word is worse than folly. Living in open contradiction to the counsel of Proverbs 3:5, so that you place your trust in your own heart and lean wholly on your own understanding, is the most spiritually insane way to live.
No right-thinking person wants to live like a fool or like someone worse than a fool.