As it is said, fire consumes the forest, so, O Lord, You have brought low the nations that envy the renewal of Jerusalem; for fire swiftly and fiercely devours the woods. The subsequent flame serves to clarify this: like fire, etc. Similarly, the declaration, You will crush them with Your fury, clarifies the words, You will harvest them with Your storm. Thus, the Lord declares, You will harvest and confound them with Your storm, meaning through Your wrath, or through a sudden and intense surge of Your anger, as noted by Isychius. For it is characteristic of a storm, along with a powerful whirlwind, to confuse and devastate what it encounters.
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The phrase: You will harvest and confound, is expressed in the future tense, either as a prophecy or as a substitute for: You will harvest and confound. Athanasius remarks: Let them receive the fire they have ignited; this fire shall consume them just as natural fire ravages a forest. A similar sentiment is echoed in these words: Behold, all of you are as if kindling a fire; yet walk in the light and flame of your fire that you have kindled (Isaiah 50:11).