John Nelson Darby discusses the distinct characteristics and purposes of the first three Gospels, emphasizing that Mark presents a chronological account of Christ's service, while Matthew focuses on the presentation of Jesus as the Messiah and the implications of His rejection. He notes that Luke, while generally following Mark's order, includes moral teachings that are unique to his Gospel. Darby highlights the importance of understanding the genealogies and the context of Christ's ministry, particularly in relation to Israel's expectations and the establishment of the church. He concludes that the Gospels collectively reveal the nature of Christ's mission and the unfolding of God's plan for humanity.