John Calvin on Jeremiah 1:14

And thus God testifies that the fire was already kindled in Chaldea and Assyria, which was not only to boil the Jews, but also reduce them to nothing. And then he expresses the same in other words — that evil would come from the north upon all the Jews. We shall hereafter see that there is presented here a brief summary of the truth which was committed to Jeremiah; at least it is a summary of one half of it; for God designed also to provide for his own elect; and he thus terrified them, that they might be subdued, and submit to him, and not that they might abandon themselves to despair. At the same time, this half of the prediction was — that there was no hope of pardon, because the Jews had with extreme obstinacy provoked God’s wrath, and had so abused his patience, that their impiety could no longer be tolerated. Hence, what other prophets had denounced Jeremiah now confirms more strongly, and points it out, as it were, by the finger. It afterwards follows —

Jeremiah 1:15

15. For, lo, I will call all the families of the kingdoms of the north, saith the LORD; and they shall come, and they shall set every one his throne at the entering of the gates of Jerusalem, and against all the walls thereof round about, and against all the cities of Judah.

15. Quoniam ecce ego voco omnes familias regnorum Aquilonis, dicit Jehova, et venient; ponent quisque solium suum in ostio postarum Jerosolymae, et super omnes muros ejus in circuitu, et super omnes urbes Jehudah.