John Nelson Darby discusses the pivotal events in Acts 8, focusing on Saul's persecution of Christians following Stephen's martyrdom, which marked the culmination of humanity's enmity against God. He emphasizes that while Saul sought to destroy the church, God's sovereign grace began to spread the gospel through the scattered believers, demonstrating the power of the Holy Spirit. The sermon highlights Philip's ministry in Samaria, where he performed miracles and preached the gospel, leading to the conversion of Simon the sorcerer and the Ethiopian eunuch. Darby notes the distinction between belief based on miracles and true faith, as well as the unique role of the apostles in imparting the Holy Spirit. Ultimately, he illustrates how God's providence uses human opposition to advance His kingdom.