John Gill Commentary Jeremiah 23:20

"The 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 perfectly." — Jeremiah 23:20 (ASV)

The anger of the Lord shall not return
Having a commission from him, and being sent forth on an errand to do business for him, it shall not return to him, without having done it; as a servant sent by his master does not return till he has finished what he was sent about:

until he have executed, and till he have performed the thoughts of his
heart ;
all his counsels, purposes, and designs, respecting those his anger kindled against, the false prophets and wicked Jews: in the latter days you shall consider it perfectly ;
when too late to avert it by repentance and reformation when all this shall be fulfilled, and the seventy years captivity take place; or, "in the end of days" ^F4 ; in the latter part of time, when the Jews shall be converted, and seek the Lord their God, (Hosea 3:5) ; then "shall [they] understand it with an understanding" ^F5 , as it may be rendered; when they shall have the veil removed from them, and turn to the Lord; then they shall have a true and thorough understanding of these things; of the cause and reason of them; and of the mind of God in them, and the ends to be answered by them.

Kimchi says this will be in the times of the Messiah.

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FOOTNOTES:

• F4: (Mymyh tyrxab) "in extremo dierum", Cocceius; "in extremitate dierum", Calvin, Piscator, Schmidt.
• F5: (hnyb hb wngwbtt) "intelligetis hoc intelligentia", Calvin, Gataker.