A.B. Simpson emphasizes the significance of Jesus Christ as the Apostle and High Priest of our profession, as highlighted in Hebrews 3:1. He explains that God has spoken to humanity through His Son, Jesus, who is superior to Moses, Joshua, and the angels, serving as the ultimate messenger of God's truth. The sermon outlines the dignity and glory of Christ, affirming His roles as the Son of God, Creator, and Sovereign Lord, and stresses the importance of recognizing Him as the living Word. Simpson encourages believers to embrace Jesus as the fulfillment of God's promises and the guide to eternal life.