• (13) For I speak to you Gentiles; inasmuch as I am an apostle to the Gentiles, I magnify my ministry, (14) if by any means I may provoke to jealousy those who are my flesh and save some of them. (15) For if their being cast away is the reconciling of the world, what will their acceptance be but life from the dead? (29) For the gifts and the calling of God are irrevocable. (30) For as you were once disobedient to God, yet have now obtained mercy through their disobedience, (31) even so these also have now been been disobedient that through the mercy shown you they also may obtain mercy. (32) For God has committed them all to disobedience, that He might have mercy on all.

The letter to the Romans was written by the apostle Paul. Chapter 11 deals with the matter of the future of the Jews in light of God’s purpose and promise which once given can never be changed. And Paul is speaking not of individuals but of the nation. Israel’s rejection of Christ is partial and not permanent – there was a remnant of believing Jews. Paul repeats that the Gentiles reception of the gospel will make Jews jealous so that they will also respond – they will want what we have. We can not deny God’s sovereign ability to save whom He choses; the gospel is all about God’s glory reflected in us.
The rejection of the gospel by the Jews was the means of its wider and more rapid spread among the Gentiles. Even the Christian Jews were very slow to allow the gospel to be preached to the Gentiles. They almost uniformly desired to clog the gospel with ceremonial observances of the law – Jesus AND. Jesus and works, Jesus and rites. This was one of the greatest hindrances of the gospel. Election is not based on works but is God’s sovereign will and plan. Israel was not successful in their works based attainment of salvation. The Jews rejected Christ and were rejected by God in return.
According to Scripture faith is an act of obedience and unbelief is an act of disobedience. The unbelief of the Jews was an historical fact; the occasion for the gospel being extended to the Gentiles. All Gentiles and Jews, first one and then the other, should reveal their true character as sinners and stand out as unbelievers. BUT God does not cause them to sin but sees to their dispensation. In sin all are equally miserable and helpless And all are dependent on God’s mercy.