15:12 Shall {n} iron break the northern iron and the steel?
(n) As for the people, though they seemed strong as iron, yet they would not be able to resist the hard iron of Babylon, but would be led captives.
15:12 The northern iron - As the northern iron and steel is the hardest, and no iron could break that, so God having edged and hardened their enemies, the Chaldeans, all opposition to them would signify nothing.
15:10-14 Jeremiah met with much contempt and reproach, when they ought to have blessed him, and God for him. It is a great and sufficient support to the people of God, that however troublesome their way may be, it shall be well with them in their latter end. God turns to the people. Shall the most hardy and vigorous of their efforts be able to contend with the counsel of God, or with the army of the Chaldeans? Let them hear their doom. The enemy will treat the prophet well. But the people who had great estates would be used hardly. All parts of the country had added to the national guilt; and let each take shame to itself.