D.L. Moody emphasizes that what may appear as failure in God's work is often a part of His greater plan. He uses the example of John the Baptist, whose life and death served to glorify Christ, demonstrating that true success is measured by the impact one has in pointing others to Jesus. Moody highlights that even the seemingly insignificant actions of God's servants can lead to monumental outcomes, as seen in the lives of Stephen and the apostles. He reassures that God's purpose prevails, and every apparent setback can lead to a greater victory in His kingdom. Ultimately, the message is that in our decrease, Christ's increase is what truly matters.