Updated: June 14, 2018
… the simplest way to summarize the two covenants is this. In the Old Covenant at Mt Sinai, Israel promised: “All that the LORD hath spoken we will do.” Exodus 19:8. And it was their very words that caused them to fail. They thought that in their own strength they could obey God.
With the everlasting covenant, or the new covenant, Christ has promised to obey on our behalf. So for the New Testament Christian, everything that God says to do, Christ will do in them. Their faith is in Him. He lives out His perfect life in them.
The first was a covenant of works which failed, because man will always fail on his own. The other is trusting Christ to work out His salvation through you.
Parchment, April 6, 2018, page 5