D.L. Moody shares his experience in California, where he aimed to save souls on the Pacific coast. He used a blackboard to contrast earthly treasures like gold, houses, and tobacco with heavenly treasures such as Jesus, heaven, and the crown of glory. This visual comparison helped illustrate the superiority of spiritual wealth over material possessions. The teacher, initially focused on earthly gains, was moved by this lesson and ultimately accepted Christ, marking a significant moment in Moody's mission. Moody emphasizes the importance of recognizing the eternal value of heavenly treasures over temporary earthly ones.