Reflecting on the historical fate of his people, Paul does not separate them from the Kingdom to which he bears witness. He does not doubt that the fate of the Jewish people precisely as the people of God is by no means over, that the Jews stumbled on the way into the Kingdom not in order to fall and never rise again (v. 11). The history of the Kingdom is paradoxical: former Gentiles go there ahead of those whom the Savior Himself called first, and the Jews' unwillingness to be first on this path only heats up the enthusiasm of those who are going. But the apostle is sure that at the end of time, when the Kingdom is revealed in all its fullness, his tribesmen will enter it, so that neither the fullness of the Kingdom nor the resurrection itself will be possible without their participation (vv. 12-15).
Paul understands that the people of God, conceived by God even before He created the world, were conceived by God as a people sanctified by His presence, "holy," and this holiness was not the people's privilege, but part of God's plan for the salvation of the world and humanity. That is why it is not determined solely by the historical fate of the Jewish people, within whom God always finds the remnant that corresponds to His plan for what His people should be. In the apostle's expression, the people's "holy root" has not gone anywhere simply because it cannot disappear. Its disappearance would mean the failure of God's whole plan of salvation, and that is impossible by definition.
And if so, then the branches too are made holy by the holy root (v. 16). Paul, as we can see, remains faithful to the prophetic tradition where the attitude toward Gentiles is concerned. The ancient prophets said more than once that in the messianic Kingdom, the remnant of God's people would meet Gentiles who sought the true God and finally found Him. But the apostle understands that God's priorities have remained the same: His people remain His people, and the salvation of former Gentiles is possible only if they acknowledge the fact obvious to Paul, that there is and can be no other people of God besides the one whose history begins with the call of Abraham. To illustrate this position clearly, the apostle uses the image of grafting and cultivating a wild olive tree, something that would be completely impossible if, first, there did not exist a "good" olive tree, a cultivated variety, and if, second, no gardener were found who was able and willing to perform such an operation (vv. 17-24).
As we can see, for Paul the history of the people of God is one single spiritual process, in which the fate of the Jewish people, the ministry of the remnant, and the history of the Kingdom become one whole.
