The sermon centers on Isaiah 9:6 as a profound declaration of Christ's dual nature and redemptive mission, presenting Him as both a child born in human flesh and a Son given in divine eternity. It emphasizes that this prophecy transcends historical figures like Hezekiah, pointing uniquely to Jesus Christ as the eternal Son of God, eternally begotten, yet incarnate for humanity's salvation. The distinction between 'a child is born' and 'a son is given' underscores the unity of Christ's full humanity and full divinity, essential for His role as prophet, priest, and king, and as the ultimate propitiation for sin. The message calls for a faithful embrace of both natures, warning that rejecting either—whether His deity or His humanity—leads to a distorted Christ and eternal loss. Ultimately, the passage is presented as a divine fulfillment of God's eternal decree, where the light of redemption shines upon those in darkness, not for angels or the world's acclaim, but for the redeemed people of God, whose salvation is secured by the Father's gift of His Son.