C. F. Keil and Franz Delitzsch on Proverbs 28:5

Pro 28:5

A similar antithetic distich:

Wicked men understand not what is right;

But they who seek Jahve understand all.

Regarding the gen. expression אנשׁי־רע, vid., under Pro 2:14. He who makes wickedness his element, falls into the confusion of the moral conception; but he whose end is the one living God, gains from that, in every situation of life, even amid the greatest difficulties, the knowledge of that which is morally right. Similarly the Apostle John (1Jo 2:20): “ye have an unction from the Holy One, and ye know all things” (οἴδατε πάντα): i.e., ye need to seek that knowledge which ye require, and which ye long after, not without yourselves, but in the new divine foundation of your personal life; from thence all that ye need for the growth of your spiritual life, and for the turning away from you of hostile influences, will come into your consciences. It is a potential knowledge, all-comprehensive in its character, and obviously a human relative knowledge, that is here meant.