A.B. Simpson explores Isaiah 6, emphasizing the significance of the prophecy regarding the virgin birth of Jesus Christ as a divine sign to Israel and the world. He highlights King Ahaz's refusal to seek God's guidance during a time of crisis, leading to the prophetic declaration of 'Immanuel'—God with us. Simpson argues that the Incarnation is not only a miraculous event but also a profound revelation of God's love and commitment to humanity. He asserts that the birth of Christ signifies a supernatural intervention in human history and serves as a guarantee of God's promises. Ultimately, the sermon calls believers to recognize the importance of Christ's presence in their lives and the transformative power of His Incarnation.