(21) I will this once cause them to know . . .--The warning comes with all the emphasis of iteration, this once. As in a way without a parallel, once for all, they should learn that the name of the God they had rejected was Jehovah, the Eternal (Exodus 3:14), unchangeable in His righteousness. The thought is parallel to that of Ezekiel 12:15.

Verse 21. - The final answer of Jehovah. There will be no further grace-time. I will this once cause them to know; rather, I will this time (comp. on Jeremiah 10:18) cause them to acknowledge. The judgment which Jeremiah has had the sad duty of announcing will prove to the blinded Jews that Jehovah alone is true God, alone can strike and heal.

16:14-21 The restoration from the Babylonish captivity would be remembered in place of the deliverance from Egypt; it also typified spiritual redemption, and the future deliverance of the church from antichristian oppression. But none of the sins of sinners can be hidden from God, or shall be overlooked by him. He will find out and raise up instruments of his wrath, that shall destroy the Jews, by fraud like fishers, by force like hunters. The prophet, rejoicing at the hope of mercy to come, addressed the Lord as his strength and refuge. The deliverance out of captivity shall be a figure of the great salvation to be wrought by the Messiah. The nations have often known the power of Jehovah in his wrath; but they shall know him as the strength of his people, and their refuge in time of trouble.Therefore, behold, I will this once cause them to know,.... Or, "at this time", as the Targum; when the Gentiles shall be convinced of the idolatry they have been brought up in, and of the vanity and falsehood of their idols; they shall be made to know the true God, God in Christ, Christ himself, whom to know is life eternal, and to know the way of life and salvation by him; and all this through the ministry of the Gospel that should be brought among them, the Spirit of God accompanying it; by means of which they should come to Christ from the ends of the earth, before predicted.

I will cause them to know my hand and my might; to experience the power and efficacy of his grace in conversion; quickening their dead souls, softening their hard hearts, taking away the stony heart, and giving a heart of flesh; and making them willing in the day of his power to be saved by Christ, and to serve him; to relinquish their idols, and turn to and worship the living God in spirit and in truth: though most understand this not as a promise of grace to the Gentiles, but as a threatening of punishment to the idolatrous Jews; that because of their idolatry they should once for all, or by this one and grievous calamity, captivity in Babylon, be made to know what they could not be brought to know by all the instructions and warnings of the prophets; they should now feel the weight of the Lord's hand, the lighting down of his arm with the indignation of his wrath; and so the Targum,

"I will show them my vengeance and the stroke of my power.''

And they shall know that my name is the Lord; the Jehovah, the self-existent Being, the Being of beings, the everlasting and unchangeable I AM; who is able to make good his promises, or perform his threatenings; a name incommunicable to creatures, which do not belong to the idols of the Gentiles, is peculiar to the true God, who is the most High in all the earth; see Psalm 83:18.