As Paul steps back from the details in Romans 11, he is ableto see the big picture and it is a vision of mercy on the part of God.  As God comes into this world, he finds disobedience among all nations, but God remains faithful to his promises andworks mercy, mercy for all peoples, Jews and Gentiles, in Christ.  Though the world be disobedient, God will remain merciful.  Merciful to all people who believe in Jesus Christ.