Summary
Classic Reformed covenant theology sees substantial unity in God’s saving purpose. Promises, sacrifices, circumcision, and other old-covenant ordinances anticipated Christ; the new covenant administers the same grace with greater clarity and fullness. Ceremonial and civil laws expire with their redemptive-historical purpose, while the moral law continues.
What this contributes
This reading strongly unifies Scripture and the people of God while preserving development from promise to fulfilment. It explains why the New Testament can appropriate Israel’s Scriptures directly for the church.
Question to keep in view
Critics argue that the model can understate the newness of Jeremiah 31 or too quickly transfer promises made specifically to Israel to the church.