Verse 6 summarizes Isaiah’s argument throughout the entire volume to this point, chapters 40-44.
First, God is: 1) God, 2) king, 3) redeemer, and 4) the Almighty Lord of Hosts. Second, he and Messiah are one, according to the New Testament. Finally, there is no other god who saves. The point of all this is that God in his great love for his own people pleads with them to turn back to him and be saved. His plea still stands for all Israel’s children and for Gentiles, as well. …