George Fox emphasizes the evolution of the apostles' preaching, starting with the proclamation of Christ's death and fulfillment of prophecy, moving to the revelation of Christ within believers. He highlights that while the apostles preached repentance and faith to the world, they also taught that Christ dwells in those who believe, transforming them and making them new creations. Fox points out that for the redeemed, the teachings of repentance and baptism become unnecessary as they are already brought to God. He stresses the importance of recognizing the eternal priesthood of Christ, who is without beginning or end, and encourages believers to embrace this truth.