G. Campbell Morgan emphasizes the significance of the Second Advent in the Christian experience, illustrating how it serves as the foundation for faith, inspires labor, and fosters patience among believers. He highlights that the Thessalonian Christians, despite facing persecution, found comfort and motivation in the promise of Christ's return, which reassured them of their faith and the ultimate victory over suffering. Morgan calls for a response of sanctification in personal life, love for others, and honesty in the world, urging believers to live in anticipation of Christ's return. He warns against the dangers of losing sight of this doctrine, which can lead to unbelief and spiritual indifference. Ultimately, he encourages the church to embrace the hope of the Second Advent as a catalyst for active faith and service.