Proverbs 29:18

See here, I. The misery of the people that want a settled ministry: Where there is no vision, no prophet to expound the law, no priest or Levite to teach the good knowledge of the Lord, no means of grace, the word of the Lord is scarce, there is no open vision (Sa1 3:1), where it is so the people perish; the word has many significations, any of which will apply here. 1. The people are made naked, stripped of their ornaments and so exposed to shame, stripped of their armour and so exposed to danger. How bare does a place look without Bibles and ministers, and what an easy prey is it to the enemy of souls! 2. The people rebel, not only against God, but against their prince; good preaching would make people good subjects, but, for want of it, they are turbulent and factious, and despise dominions, because they know no better. 3. The people are idle, or they play, as the scholars are apt to do when the master is absent; they do nothing to any good purpose, but stand all the day idle, and sporting in the market-place, for want of instruction what to do and how to do it. 4. They are scattered as sheep having no shepherd, for want of the masters of assemblies to call them and keep them together, Mar 6:34.

— Matthew Henry's Concise Commentary (public domain)

no vision--instruction in God's truth, which was by prophets, through visions (Sa1 3:1). people perish--(Compare Margin), are deprived of moral restraints. keepeth the law--has, and observes, instruction (Pro 14:11, Pro 14:34; Psa 19:11).

— Jamieson-Fausset-Brown Commentary (public domain)