John Calvin on Jeremiah 30:17

When God promised favor to the Jews, he referred to their enemies; for it would have been a grievous temptation, which would have otherwise not only disturbed and depressed their minds, but also extinguished all faith, to see their enemies enjoying all they could wish, and successful in everything they attempted, had not this consolation been granted them, — that their enemies would have at length to render an account for the wickedness in which they gloried. But now the main thing is here expressed, — that God, when reconciled to his people, would heal the wounds which he had inflicted; for he who inflicts wounds on us, can alone heal us. He exercises judgment in punishing, he afterwards undertakes the office of a Physician, to deliver us from our evils. It is, therefore, the same as though the Prophet had said, “When the right time shall pass away, which God has fixed as to his people, deliverance is to be hoped for with certainty; for the Lord has decreed to punish his people only for a time, and not wholly to destroy them.”

Iwill bring thee, he says, healing, and will heal thee of thy wounds And this admonition was very necessary, for the Jews had nearly rotted in their exile when God delivered them. They might have then been a hundred times overwhelmed with despair; but God bids them here to raise upwards their minds, so as to expect help from heaven, for there was none on earth. And he adds, because they called thee, Zion, an outcast whom no one seeketh; that is, of whom, or of whose welfare, no one is solicitous. He confirms what I have before said, — that the extreme evils of the people would be no hinderance when God came to deliver them, but, on the contrary, be the future occasion of favor and mercy. When, therefore, the people should become so sunk in misery as to make all to think their deliverance hopeless, God promises that he would then be their Redeemer. And this is what we ought carefully to notice: for we look around us here and there, whenever we hope for any help; but God shews that he will be then especially propitious to us, when we are in a hopeless state according to the common opinion of men. It follows, —

Jeremiah 30:18

18. Thus saith the LORD; Behold, I will bring again the captivity of Jacob’s tents, and have mercy on his dwellingplaces; and the city shall be builded upon her own heap, and the palace shall remain after the manner thereof.

18. Sic dicit Jehova, Ecce ego reducens captivitatem tabernaculorum Jacob et habitaculorum ejus miserabor; et adificabitur urbs super excelsum suum (vel, super acervum suum; vel, culmen) et palatium in sua statione (vel, regula) sedebit.