so the book follows a chronological progression from Adam to Noah to Abraham to Moses to David to Christ excuse me and that allows for the natural unfolding nature or the unfolding nature of God's purposes in history because as I said mystery is a part of God's revelation something that was revealed previously and Paul says now it has been re revealed in a new way it's been revealed more fully more openly through Jesus pouring out his Spirit on the apostles and the apostles teaching the church more and more and more as even the apostles themselves learned more and more and more about the the mystery of Christ and the union of all peoples in him and so if you take a Biblical the theological approach a historical Progressive approach then in a sense you get to learn it the way that it was learned in history you get to see okay the what our confession calls the farther steps of God's revelation of the Covenant of Grace or the New Covenant which I regard as the same thing uh as opposed to just jumping straight to chapter one Covenant of Works Covenant of Grace sort of soteriology systematic theology and that's that's why you'll see a historical progression and I I want to emphasize the the importance of that um in a sense you learn covenant theology the way that God's people have progressively and I think there's a real advantage in that