Don’t try to understand it all at once, what I’m saying will explain it. We would say that the Covenant of Grace started not in the Garden, but at the Cross. The Noahic, Abrahamic, Mosaic, and the Davidic Covenants are not a part of the Covenant of Grace. There is grace there, but they are all conditional covenants, covenants that can be broken. The Covenant of Grace was only conditional for the purchaser, Jesus Christ. He kept the covenant that we could not keep. He is the Covenant Keeper, and He drank every drop of the wrath that we’ve earned. The only thing left in the cup for us is grace. The New Covenant is the Covenant of Grace. Furthermore, the New Covenant is the first covenant that offers eternal life since the Covenant of Works back in the garden. The Noahic covenant offered temporary life, having refrained from justly destroying everyone for their sin. The Abrahamic covenant offered land and offspring, not eternal life. The Mosaic covenant offered long, but not eternal, life, as well as the right to stay in the land that was promised to Abraham, as long as the conditions were met. The Davidic covenant offered kingship to Israel so long as it stayed in the land, and promised a future King, but eternal life was not a part of it. But in the New Covenant, what is offered is not primarily land, even though we will inherit the new heavens and the new earth. What is offered is life, and life eternal. And this not of works, like in the covenant made with Adam. That’s why we call that covenant the Covenant of Works. No, it is of grace, and so we call the New Covenant, unlike the others, the Covenant of Grace.