Paul combats the Judaizers by defending the message of the Gospel of God. Paul uses his own personal testimony as direct revelation of God and evidence for the real life-transforming power of grace, which not only transformed his motivation but was also accepted by the apostles of Jesus Christ. The grace of God called Paul into a life of radical service for God and others, reflecting God's compassion and mercy towards a zealous sinner. It also cost Paul much of what he once thought was valuable, as the message of grace showed him that God's purposes were bigger. This teaching also includes a testimony by Mary Barnum highlighting the offensiveness of the gospel message.