John Owen emphasizes the significance of Christ's offices as king, priest, and prophet in the redemption and salvation of the church. He explains that the efficacy of these offices stems from the divine nature of Christ, which enables Him to fulfill roles that no mere human could. Owen argues that true benefits from Christ's offices require faith in His divine person, as it is through this faith that believers access the grace and truth necessary for salvation. He highlights that the Old Testament figures, while significant, could not achieve the eternal salvation that Christ accomplishes through His unique divine-human nature. Ultimately, Owen asserts that understanding and believing in the person of Christ is essential for receiving the full benefits of His mediatorial work.