In Part 8 of Grace Alone, Pastor Matt shares on the weakness of man vs. the power of God. When we live life legalistically, our right standing with God is based on what we do, not what Jesus has done. In Galatians, legalism was causing many believers to turn back to the world. This happened because they were putting their faith in something other than Jesus.
Paul is a man who has been totally transformed by the grace of God. Paul is willing to expose his own weakness so that the power of God might be made manifest. A grace filled environment creates a safe place for people to confess their sin and see God's power!