What did Paul call the doctrine of grace?
Paul usually referred to the doctrine of grace as the Revelation of the Mysteries. This doctrine was given to him after Damascus, when God, who had given the Law to Moses at Sinai, revealed these truths to Paul in Arabia.
Les explains that after Saul’s escape from Damascus, God took him down to Mount Sinai in Arabia, as Paul later tells us in Galatians chapter 1. At that very same place where God gave the Law to Moses, God now gave to this man the whole doctrines of grace. Les points out that in this doctrine of grace, Paul will usually refer to it as the Revelation of the Mysteries.