Even all nations shall say,.... For the destruction of this land, and the people of it, would be, as it has been, so very great and awful, and so very remarkable and surprising, that the fame of it would be heard among all the nations of the world, as it has been; who, upon hearing the sad report of it, would ask the following questions:

wherefore hath the Lord done thus unto this land? so distinguished from all others for the fruitfulness and pleasantness of it; the people, the inhabitants of which, he chose, above all others, to be a special and peculiar people; and where he had a temple built for him, and where he had his residence, and worship used to be given unto him:

what meaneth the heat of this great anger? what is the reason of his stirring up his fierce wrath, and causing it to burn in so furious a manner? surely it must be something very horrible and provoking indeed!

"What is this great burning of wrath?" i.e., what does it mean - whence does it come? The reply to such a question would be (Deuteronomy 29:25-29): The inhabitants of the land have forsaken the covenant of the Lord, the God of their fathers; therefore has the wrath of the Lord burned over the land.

Even all nations shall say, Wherefore hath the LORD done thus unto this land? what meaneth the heat of this great anger?

29:22-28 Idolatry would be the ruin of their nation. It is no new thing for God to bring desolating judgments on a people near to him in profession. He never does this without good reason. It concerns us to seek for the reason, that we may give glory to God, and take warning to ourselves. Thus the law of Moses leaves sinners under the curse, and rooted out of the Lord's land; but the grace of Christ toward penitent, believing sinners, plants them again in their land; and they shall no more be pulled up, being kept by the power of God.