Isaiah 53: Why the Servant Had to Die
Isaiah 53 answers the question of why the servant dies: not for his own sin, but because Yahweh laid the iniquity of all on him. His death is an offering for sin that God purposes, accepts, and turns toward offspring and justification.
Isaiah 42:8: God Will Not Share His Glory
God's zeal for his own glory is the settled commitment of the only true God to be known as he actually is. Isaiah 42:8 ties that commitment to his name and sets it against every rival, including the idols of the nations.