John Nelson Darby emphasizes the transformative power of Jesus as the resurrection and the life, illustrated through the story of Lazarus, who, after being raised from the dead, represents the believer's new life and liberty in Christ. The sermon highlights the roles of Martha and Mary, showcasing service and worship that stem from a relationship with Jesus, and the importance of giving our best to Him, akin to Mary pouring out her costly spikenard. Darby also points out that true testimony of faith is not just in words but in the manifestation of a new life in communion with Christ, which can lead others to believe. He concludes by reflecting on the unique revelation of God in Christ, emphasizing that there is nothing like Him.