Commentaries:
Jamieson, Fausset, and Brown
cleanseth—that is, cleareth the air of clouds. When the "bright light" of the sun, previously not seen through "clouds," suddenly shines out from behind them, owing to the wind clearing them away, the effect is dazzling to the eye; so if God's majesty, now hidden, were suddenly revealed in all its brightness, it would spread darkness over Job's eyes, anxious as he is for it (compare, see on Job 37:19) [UMBREIT]. It is because now man sees not the bright sunlight (God's dazzling majesty), owing to the intervening "clouds" (Job 26:9), that they dare to wish to "speak" before God (Job 37:20). Prelude to God's appearance (Job 38:1). The words also hold true in a sense not intended by Elihu, but perhaps included by the Holy Ghost. Job and other sufferers cannot see the light of God's countenance through the clouds of trial: but the wind will soon clear them off, and God shall appear again: let them but wait patiently, for He still shines, though for a time they see Him not (see on Job 37:23).
Other Jamieson, Fausset, and Brown entries containing Job 37:21:
Job 37:22
Job 37:23
Isaiah 18:4
Habakkuk 3:4
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