Who is the wise man Or, Is there not a wise man, who understands this? Is there none of you so well acquainted with the will of God and the methods of his providence, as to be able to declare the reasons why he has given such severe instances of his anger against this land? The question implies, that there are none, or very few, that consider common calamities in the cause of them, but rather impute the divine chastisements to chance, not seeing the hand of God in them. And the Lord saith. Because they have forsaken my law, &c. Here God himself declares the reasons of his judgments by the mouth of his prophet.
Related Commentaries of Jeremiah 9:12
Jeremiah 9:12-13
12 Who is the wise man, that may understand this? and who is he to whom the mouth of the LORD hath spoken, that he may declare it, for what the land perisheth and is burned up like a wilderness, that none passeth through?
13 And the LORD saith, Because they have forsaken my law which I set before them, and have not obeyed my voice, neither walked therein;