John Nelson Darby emphasizes the radical transformation of the priesthood and the entire system of worship as revealed in Hebrews 7. He contrasts the priesthood of Melchisedec with the Aaronic priesthood, highlighting that Christ, as the eternal High Priest, has established a new covenant that supersedes the old law. Darby explains the significance of God's names—Almighty, Jehovah, Father, and Most High—and how they relate to our understanding of God and our relationship with Him through Christ. He stresses that through faith in Christ, believers are adopted as sons of God, possessing eternal life and direct access to the Father. The sermon concludes with the assertion that the old system is obsolete, and believers now stand in a new relationship with God, free from the law's condemnation.