Romans 11:30

(16) For as ye in times past have not believed God, yet have now obtained mercy through their unbelief:

(16) Another reason: because even though they who are hardened are worthily punished, yet this stubbornness of the Jews has not so that there would be a hatred of that nation, but so that an entry might be as it were opened to bring in the Gentiles, and afterward the Jews being inflamed with jealousy of that mercy which is shown to the Gentiles might themselves also be partakers of the same benefit, and so it might appear that both Jews and Gentiles are saved only by the free mercy and grace of God, which could not have been so manifest if at the beginning God had brought all together into the Church, or if he had saved the nation of the Jews without this interruption.