G. Campbell Morgan emphasizes the contrast between the Church of God and the city of Corinth, highlighting how the spirit of the city has invaded the church, leading to failure in fulfilling its divine responsibilities. He discusses the causes of this failure, including religious license, moral laxity, and social disorder, and stresses the need for the church to realize its own life in Christ to succeed. The sermon calls for a recognition of the church's responsibility to influence the city positively, proclaiming the resurrection of Christ as the central message. Morgan urges the church to separate from the city's corrupting influences and to embody the love and purity of Christ in its mission. Ultimately, he encourages believers to be steadfast and active in their faith, fulfilling their role in the world.