Where did Paul receive the doctrines of grace?
Paul received the doctrines of grace at Mount Sinai in Arabia, as he later tells us in Galatians chapter 1. From Damascus, God led him to that same place where He had given the Law to Moses, and there God revealed to Paul the whole doctrines of grace, which Paul calls the Revelation of the Mysteries.
Les explains that after Paul escaped Damascus by being let down the wall in a basket in the middle of the night, he went from Damascus down to Mount Sinai in Arabia. This is the same location where God gave the Law to Moses. Les teaches that at that same place, God gave Paul the whole doctrines of grace, which Paul usually refers to as the Revelation of the Mysteries.