I cite Cymbala who explained the New Covenant:
“To fully understand the New Covenant, we must understand the Holy Spirit and what he does. The Old Covenant, which was characterized by the Law given to Moses, was a set of external commands. The New Covenant is about Christ’s atoning death and resurrection from the grave, followed by the sending of the Holy Spirit to work inside us in grace and power.”
It has been my focus to give reasons to believe in the work of the indwelling Holy Spirit in repentant believers in our time.