The last of these verses throws a light on the whole passage, by way of explanation, on the principles of the gospel of Christ. All men are as reprobate silver, until the Great Refiner and Purifier of silver hath brought them through the furnace of his regenerating and renewing Spirit. All in themselves are forever rejected, until chosen and accepted in Jesus. Ephesians 1:4-7.
Jeremiah 6:22-30
22 Thus saith the LORD, Behold, a people cometh from the north country, and a great nation shall be raised from the sides of the earth.
23 They shall lay hold on bow and spear; they are cruel, and have no mercy; their voice roareth like the sea; and they ride upon horses, set in array as men for war against thee, O daughter of Zion.
24 We have heard the fame thereof: our hands wax feeble: anguish hath taken hold of us, and pain, as of a woman in travail.
25 Go not forth into the field, nor walk by the way; for the sword of the enemy and fear is on every side.
26 O daughter of my people, gird thee with sackcloth, and wallow thyself in ashes: make thee mourning, as for an only son, most bitter lamentation: for the spoiler shall suddenly come upon us.
27 I have set thee for a tower and a fortress among my people, that thou mayest know and try their way.
28 They are all grievous revolters, walking with slanders: they are brass and iron; they are all corrupters.
29 The bellows are burned, the lead is consumed of the fire; the founder melteth in vain: for the wicked are not plucked away.
30 Reprobatee silver shall men call them, because the LORD hath rejected them.