1. God calls all believers 'my people' (19-26)
God is the Sovereign Creator. He makes each person for a purpose. But he is not bound fatalistically to any plan. He is free to use his sovereignty for his own purpose, and his purpose is world redemption. The Gentile world was destined for destruction because of their sins--idolatry and unbelief. But when God, in his mercy, called Gentiles to himself, some responded in faith and became his people.
2. A remnant will be saved (27-29)
Israel should have rejoiced to see the riches of God's mercy. But they rejected the Messiah and God's love and became objects of his wrath, like the unbelieving world. There is no promise that anybody will be saved because of past privilege. Throughout history God has spared and worked through a remnant of faithful people. So Isaiah's prophecy is fulfilled.
Application: Sovereign Lord, I have no claim on your mercy, but by your grace and mercy make me one of your remnant.
One Word: A remnant saved by God's grace