Note, I. As the prevalency of men's lusts is owing to the darkness of their understandings, so the darkness of their understandings is very much owing to the dominion of their lusts: Men understand not judgment, discern not between truth and falsehood, right and wrong; they understand not the law of God as the rule either of their duty or of their doom; and, 1. Therefore it is that they are evil men; their wickedness is the effect of their ignorance and error, Eph 4:18. 2. Therefore they understand not judgment, because they are evil men; their corruptions blind their eyes, and fill them with prejudices, and because they do evil they hate the light. It is just with God also to give them up to strong delusions. II. As men's seeking the Lord is a good sign that they do understand much, so it is a good means of their understanding more, even of their understanding all things needful for them. Those that set God's glory before them as their end, his favour as their felicity, and his word as their rule, and apply to him upon all occasions by prayer, they seek the Lord, and he will give them the spirit of wisdom. If a man do his will, he shall know his doctrine, Joh 7:17. A good understanding those have, and a better they shall have, that do his commandments, Psa 111:10; Co1 2:12, Co1 2:15.