In Jeremiah’s prophecy of the new covenant, Jeremiah explicitly says, “It will not be like the covenant I made with their forefathers, when I led them by the hand out of Egypt” (Jer. 31:32). How will it be different? For one thing, it will be unbreakable (v. 32). For another, all the members of that covenant will be regenerate, the law written on their hearts (v. 33). Yet another difference will be that the covenant will not operate according to natural lines of birth and descent, but through spiritual birth (vv. 29-30). Here the discontinuity between the new covenant and the Mosaic covenant is enormous: a covenant of grace, not works; a covenant that regenerates rather than kills; a covenant entered into through spiritual rather than natural birth. And yet for all this discontinuity, Jeremiah is clear that this new covenant is the ultimate fulfillment of God’s promises to Israel, made to their forefather Abraham.