In the term "mystery," Paul refers to wisdom, which is implicit in the Old Testament and revealed through the Spirit's work in the apostles.
Paul defends himself against the Romans who accuse him of misunderstanding law in the life of the New Covenant believer.
The Apostle Paul was both a master theologian and a missionary despite modern objections to this fact.
You cannot have a theology that is completely determined by God’s sovereign grace and a practice that views salvation as a cooperative venture between God and human beings.
God sets circumstances in each of our lives with the objective of conforming us to the likeness of Christ.