Thus Christians from among the Gentiles have no grounds whatever for boasting over the unconverted Jews. This is especially so because the Gentile Christians themselves were recently far from God, and yet by God's mercy received mercy. In the same way the Jews too can receive mercy.
Moreover, just as the apostasy of the Gentiles was the occasion for the election of the Jews, so now the rejection of the Jews has become the occasion for the calling of the Gentiles. Therefore all nations, like the Jews, are sinful, and all can be saved by the mercy of God.
In explanation of this passage Ambrosiaster writes: "The Jews were struck with blindness only for a time, and among them only those who, zealous for the law, did not see that the good things promised by God had come in Jesus Christ the Lord and were being proclaimed.
"By such stumbling they were blinded in part, so that they might suffer for their unbelief, seeing the Gentiles gladly profit from their unbelief and enter into the inheritance of Abraham's promise. But when the full number of the Gentiles comes in, then blindness will fall from the eyes of their mind, and they will be able to believe, and they will believe."
Explaining the words of verse 26, Chrysostom observes: "Since what the Apostle proclaims is important, he brings in as witness the prophet who says the same. He does not offer testimony that blindness occurred, since this is evident.
"But that the Jews will believe and be saved is witnessed by Isaiah, who cries out and says: 'The Deliverer will come from Zion, and He will turn away ungodliness from Jacob.'"
Concerning the words, "For God has shut up all in disobedience," he says: "He convicted all and declared all disobedient, not so that all should remain disobedient, but so that He might save some through the obstinacy of others: the Jews through the Gentiles, and the Gentiles through the Jews."