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Jeremiah proceeds with the same subject, but shews more clearly how much more abundant and richer the favor of God would be towards his people than formerly, he then does not simply promise the restoration of that dignity and greatness which they had lost, but something better and more excellent. We hence see that this passage necessarily refers to the kingdom of Christ, for without Christ nothing could or ought to have been hoped for by the people, superior to the Law; for the Law was a rule of the most perfect doctrine. If then Christ be taken away, it is certain that we must abide in the Law.

We hence then conclude, that the Prophet predicts of the kingdom of Christ; and this passage is also quoted by the Apostles, as being remarkable and worthy of notice. (Romans 11:27; Hebrews 8:8-12; Hebrews 10:16)

But we must observe the order and manner of teaching here pursued. The Prophet confirms what I have before said, that what we have been considering was incredible to the Jews. Having then already spoken of the benefits of God, which could have been hardly recognised by the senses of men, in order to obviate the want of fifith, he adds, that the Lord would manifest his mercy towards them in a new and unusual manner. We hence see why the Prophet added this passage to his former doctrine. For had he not spoken of a new covenant, those miserable men, whom he sought to inspire with the hope of salvation, would have ever vacillated; nay, as the greater part were already overwhelmed with despair, he would have effected nothing. Here then he sees before them a new covenant, as though he had said, that they ought not to look farther or higher, nor to measure the benefit of God, of which he had spoken, by the appearance of the state of things at that time, for God would make a new covenant.

There is yet no doubt but that he commends the favor of God, which was afterwards to be manifested in the fullness of time. Besides, we must ever bear in mind, that from the time the people returned to their own country, the faith of those who had embraced the favor of deliverance was assailed by the most grievous trials, for it would have been better for them to continue in perpetual exile than to be cruelly harassed by all their neighbors, and to be exposed to so many troubles. If, then, the people had been only restored from their exile in Babylon, it was a matter of small moment; but it behoved the godly to direct their minds to Christ. And hence we see that the Prophets, who performed the office of teaching after the restoration, dwelt on this point, — that they were to hope for something better than what then appeared, and that they were not to despond, because they saw that they did not enjoy rest, and were drawn into weary and grievous contests rather than freed from tyranny. We indeed know what Hagggai says of the future temple, and what Zechariah says, and also Malachi. And the same was the object of our Prophet in speaking of the new covenant, even that the faithful, after having enjoyed again their own country, might not clamor against God, because he did not bestow on them that happiness which he had promised. This was the second reason why the Prophet spoke of the new covenant.

As before, he now repeats the words, that the days would come, in which God would make a covenant with Israel as well as with Judah. For the ten tribes, as it is well known, had been driven into exile while the kingdom of Judah was still standing. Besides, when they revolted from the family of David, they became as it were another nation. God indeed did not cease to acknowledge them as his people; but they had alienated themselves as far as they could from the Church. God then promises that there would be again one body, for he would gather them that they might unite together, and not be like two houses.

Now, as to the new covenant, it is not so called, because it is contrary to the first covenant; for God is never inconsistent with himself, nor is he unlike himself, he then who once made a covenant with his chosen people, had not changed his purpose, as though he had forgotten his faithfulness. It then follows, that the first covenant was inviolable; besides, he had already made his covenant with Abraham, and the Law was a confirmation of that covenant. As then the Law depended on that covenant which God made with his servant Abraham, it follows that God could never have made a new, that is, a contrary or a different covenant. For whence do we derive our hope of salvation, except from that blessed seed promised to Abraham? Further, why are we called the children of Abraham, except on account of the common bond of faith? Why are the faithful said to be gathered into the bosom of Abraham? Why does Christ say, that some will come from the east and the west, and sit down in the kingdom of heaven with Abraham, Isaac, and Jacob? (Luke 16:22; Matthew 8:11) These things no doubt sufficiently shew that God has never made any other covenant than that which he made formerly with Abraham, and at length confirmed by the hand of Moses. This subject might be more fully handled; but it is enough briefly to shew, that the covenant which God made at first is perpetual.

Let us now see why he promises to the people a new covenant. It being new, no doubt refers to what they call the form; and the form, or manner, regards not words only, but first Christ, then the grace of the Holy Spirit, and the whole external way of teaching. But the substance remains the same. By substance I understand the doctrine; for God in the Gospel brings forward nothing but what the Law contains. We hence see that God has so spoken from the beginning, that he has not changed, no not a syllable, with regard to the substance of the doctrine. For he has included in the Law the rule of a perfect life, and has also shewn what is the way of salvation, and by types and figures led the people to Christ, so that the remission of sin is there clearly made manifest, and whatever is necessary to be known.

As then God has added nothing to the Law as to the substance of the doctrine, we must come, as I have already said, to the form, as Christ was not as yet manifested: God made a new covenant, when he accomplished through his Son whatever had been shadowed forth under the Law. For the sacrifices could not of themselves pacify God, as it is well known, and whatever the Law taught respecting expiation was of itself useless and of no importance. The new covenant then was made when Christ appeared with water and blood, and really fulfilled what God had exhibited under types, so that the faithful might have some taste of salvation. But the coming of Christ would not have been sufficient, had not regeneration by the Holy Spirit been added. It was, then, in some respects, a new thing, that God regenerated the faithful by his Spirit, so that it became not only a doctrine as to the letter, but also efficacious, which not only strikes the ear, but penetrates into the heart, and really forms us for the service of God. The outward mode of teaching was also new, as it is evident to all; for when we compare the Law with the Gospel, we find that God speaks to us now openly, as it were face to face, and not under a veil, as Paul teaches us, when speaking of Moses, who put on a veil when he went forth to address the people in God’s name. (2 Corinthians 3:13) It is not so, says Paul, under the Gospel, but the veil is removed, and God in the face of Christ presents himself to be seen by us. This, then, is the reason why the Prophet calls it a new covenant, as it will be shown more at large: for I touch only on things which cannot be treated apart, that the whole context of the Prophet may be better understood. Let us then proceed now with the words.