In *Wartime Gospel*, Pastor Jamie Self describes the Christian life as a spiritual battle, where believers are called to wield the Word of God as their weapon and advance His Kingdom. He emphasizes that faith is not passive but requires boldness, perseverance, and love in the face of opposition, just as Paul encouraged the Thessalonian church. The sermon challenges believers to actively live out their faith, recognizing that the ultimate victory is seeing lives transformed by the gospel.