...his is a unique promise of the New Covenant. This is the circumcision of the heart. To be sure, circumcision of the heart is sometimes commanded by God (Deut. 10:16; Jer. 4:4), but it is not granted as part of the Old Covenant. Certainly, believers under the Old Covenant, were circumcised of heart and had the Law of God written on their hearts, but not in virtue of the Abrahamic or Mosaic Covenant, but by virtue of the
retroactive New Covenant or the Covenant of Grace, which was in promise form before its formal establishment in Christ’s blood (
see Chapter 8:6 for more on this). The members of this covenant will have the Law upon their hearts and minds, it will be part of their nature, unlike Old Covenant Israel which had the Law merely in stone, and some of them, who were elect and true believers, had the law in their hearts (e.g., Ps. 40:8).
(2) God being our God and we being His people is not a unique promise for the New Covenant, but part of the Abrahamic as well as the Mosaic covenants. But obviously, this is promise a relative to the covenant in which it is given. Our relationship with God, under the New Covenant, is much greater than the saints of old experienced. We have the completed Scriptures, we have Christ not in the shadows, but in the realities. We have a greater knowledge of God and His Father’s heart and so on. Though this is not a unique aspect of the New Covenant, yet the intimacy between the redeemed and God is greater in the New Covenant. It cannot merely be assumed that because the same words of the promise are repeated that they are speaking of the one and same promise. God was a God to all Israel, even unbelievers and they could claim Him as their God, but in a different sense than that which is given here.
(3) Another unique part of the New Covenant is the fact that there will be no need to teach people, who are part of the covenant, about salvation (knowing the Lord). This obviously does not mean we do not need to study the Bible and learn about God, but rather, the point of Hebrews 8:11 is more specific, namely, the Israel with whom God will make this New Covenant will all
know Him salvifically. They will not merely hear about God and know Him among many other gods, but they will know Him intimately and be among His children and elect. That this fact concerns everyone in the covenant is seen in the way that it is described, it is said to be “all shall know me from the least of them to the greatest.” Even if there are children in the Covenant, they will know the Lord. The old ones in the Covenant will likewise know the Lord and everyone in between. Everyone who is part of this Covenant knows the Lord salvifically.
(4) The reason that all the people in the Covenant will intimately and salvifically know the true God is because He will forgive their sins. As we saw above, the Lord Jesus offered Himself as a sacrifice on behalf of His covenant people, for whom also, on the basis of His sacrifice, He mediates and intercedes. All who find themselves in this New Covenant will have their sins forgiven. The blessings of the New Covenant include regeneration, the writing of the Law on the heart and the mind, the salvific and intimate knowledge of God, and the forgiveness of sins.
5. Therefore, on the basis of these considerations, we believe that the membership of the New Covenant, which is the Covenant of Grace established in Christ’s blood, is restricted to the elect alone. They enter the Covenant by faith when ...