Commentaries:
Barnes' Notes
The plowing - The Hebrew word, with a change in its vowel points, may signify either:
(1) the "fallow field," the "tillage" of Proverbs 13:23, or
(2) the lamp.
According to: (1) the verse would mean, "The outward signs of pride, the proud heart, the broad lands of the wicked, all are evil." (2) however, belongs, as it were, to the language of the time and of the book Proverbs 13:9; Proverbs 24:20. The "lamp of the wicked" is their outwardly bright prosperity.
Other Barnes' Notes entries containing Proverbs 21:4:
Psalms 18:27
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