T. Austin-Sparks emphasizes the greatness and glory of Jesus Christ, illustrating this through the symbolism of the ark of the covenant in the Old Testament. He explains that the ark represents God's supremacy and the unique nature of Christ, who embodies the holiness, power, and grace of God. Sparks highlights the importance of understanding Old Testament typology in relation to the New Testament, asserting that the ark serves as a type of Christ, who is incorruptible and sinless. The sermon encourages believers to recognize the significance of the covenant and testimony that God has established with humanity through Christ. Ultimately, the message points to the hope of resurrection and transformation into the likeness of Christ.