And the ploughing of the wicked— Dr. Grey is for taking the two parts of the verse separately, thus, "A lofty look and a proud heart go generally together; i.e. the countenance shews the disposition of the mind, the lamp of the wicked is sin." The lamp seems to signify that which men make the rule or guide of their actions. In this sense the law of the Lord is the lamp of the righteous, but sin is the lamp of the wicked. See chap. Proverbs 6:23.Psalms 119:105.
Related Commentaries of Proverbs 21:4
Proverbs 21:4
4 An high look, and a proud heart, and the plowing of the wicked, is sin.