T. Austin-Sparks emphasizes that God is forming a spiritual and heavenly Israel in this dispensation, transitioning from the earthly principles of the Old Testament to the spiritual realities of the New Testament. He highlights Jesus as the foundation of this new Israel, referred to as the Lamb of God, whose sacrifice fulfills the role of the Passover lamb and opens the way to God. The sermon explores the significance of Jesus in establishing a new covenant, marked by an opened Heaven and a new relationship between God and His people, contrasting it with the closed Heaven of the Old Testament. Sparks illustrates how the old Israel's failures are replaced by a new Israel that is born of the Spirit, emphasizing the importance of being spiritually reborn to be part of God's family. Ultimately, he asserts that Christ is the true temple and the center of worship, uniting believers as the living temple of God.