Romans 11:31

even so have these [the Jews] also now been disobedient, that by the mercy shown to you they also may now obtain mercy. [How the Gentile received blessing by reason of the casting off of the Jew has already been explained at verse 15. As the Gentile went through a season of disobedience, from which he was saved by severity shown to the Jew, so the Jew was to have a like season of disobedience, from which he in turn is to be eventually saved by God's mercy to the Gentiles. Some construe the "mercy" to mean that the Gentiles are to have a continuous, ever-increasing spiritual prosperity until finally the very excess of the flood of it sweeps Israel into belief, and therefore into the kingdom. But such a construction plainly denies the New Testament prophecies which speak of a "falling away" (2 Thessalonians 2:3) in "the last days" (2 Timothy 3:1-9), and do not accord with the effects of gospel preaching as announced by Christ (Matthew 24:14). The meaning is that God's mercy to the Gentiles in Paul's day preserved the gospel in the world for the ultimate blessing of the Jews, and God's continued mercy to the Gentiles through the centuries, and even through the latter days of their acute apostasy, will still keep the gospel till the Jews are ready to accept it. God's mercy to the evil, Gentile earthen vessel preserves the truth wherein lies salvation, and will continue to preserve it till the Jew drinks of the water of life which it conserves (2 Corinthians 4:7). In short, the cases are reversed. The Jewish dispensation ended in a breakdown, but not until the Gentiles became receptacles of the truth. Mercy was shown to the Jew till this Gentile belief was assured. So the Gentile dispensation shall likewise terminate in failure, but not until Jewish belief is assured. We are even now obtaining mercy waiting for the consummation of that part of God's plan. As God once spared the Jew till his blessings were transferred without loss to the Gentiles, so will he now spare the Gentile till the truth now stored in him has time to pass safely to the Jew. And as surely as he shifted his Spirit and mercies from Jew to Gentile, just so surely will he in turn shift back and re-endow the Jew. The apostle is here giving, his whole attention to the acts of God, and omits for the time all reference to that human agency which paved the way for the divine action. However, it is indicated in the word "mercy." The change in either case was in justice long overdue before it came.]