‘”Behold, the days come,” says the LORD, “that I will make a New Covenant!… This shall be the Covenant that I will make…. After those days,” says the LORD, “I will put My Law in their inward parts and write it in their hearts…. And I will be their God, and they shall be My people…. And I will remember their sin no more!”‘ Jeremiah 31:31-34.
Calvin comments: “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 (Romans 11:27 and Hebrews 8:8-10 & 10:16)…. The ‘New Covenant’…is not so called because it is contrary to the first Covenant. For God is never inconsistent with Himself…. He, then, Who once made a
Covenant…, has not changed His purpose…. The first Covenant was inviolable [Hosea 6:7]….
“He already made His Covenant with Abraham; and the Law was a confirmation of that Covenant…. God could nevermake a…contrary…Covenant…. Whence do we derive our hope of salvation, except from that blessed Seed promised to Abraham?… The Covenant which God made at first, is perpetual…. God in the Gospel brings forward nothing but what the Law contains….
“The fathers who formerly were regenerated, obtained this favour through Christ…. The power then to penetrate into the heart, was not inherent in the Law — but it was a benefit transferred to the Law from the Gospel…. God does not here say, ‘I will give you another Law!'; but ‘I will write My Law (in the heart)!’ That is the same Law which had formerly been delivered to the fathers…. To write the Law in the heart imports nothing less than so to form it so that the Law should rule there!…
“‘I will forgive their sins, and their iniquities will I remember no more!’ The Prophet…shows here…God’s kindness…, that He would receive the people into favour by not imputing to them their sins…. The Apostle in the Epistle to the Hebrews…dwells on the word ‘more‘…. Under the New Testament, He remembers them (our sins) no more!… We have been so expiated by the blood of
Christ and so reconciled to God, that confidence as to our salvation ought to give us an entire rest!”
Calvin also says in his Institutes II:5:9 & II:11:7: “Nor can any cavil evade the declaration in Jeremiah (31:32), that the Covenant which God made…was broken…. To make it effectual, it was necessary for the Spirit to interpose and train the heart to obedience…. The Apostle took occasion to institute a comparison between the Law and the Gospel, calling the one a doctrine of the letter; the other a doctrine of the Spirit — describing the one as formed on tables of stone; the other on tables of the heart.”
Calvin further says in his Treatises III:224: “Christ…had not come to destroy the Law (Matthew 5:17)…, but rather to fulfil it — on bringing into the world His new Law of which He had already given a promised by Jeremiah (31). So that He might not leave it alone, maimed or imperfect in this respect!” For the days when the Lord would make a New Covenant by putting precisely His Law — in the heart! Is God’s Law in your heart?