John Gill Commentary Jeremiah 30:24

"The fierce anger of Jehovah shall not return, until he have executed, and till he have performed the intents of his heart: in the latter days ye shall understand it." — Jeremiah 30:24 (ASV)

The fierce anger of the Lord shall not return This explains what is meant by the continuing whirlwind in (Jeremiah 30:23).

until he has done [it]; his whole will and pleasure; brought Babylon to ruin, and destroyed all the antichristian powers:

and until he has performed the intents of his heart; in a way of grace and mercy to his people, and in a way of wrath and vengeance on their enemies:

in the latter day you shall consider it; this prophecy, and understand it; and see it wholly and fully accomplished.