John Chrysostom
Here at last is the clearest solution. On the basis of deeds, the Apostle proved that "not all who are of Israel are Israel" (Rom 9:6).
He confirmed this by the forefathers of Jacob and Esau and by the testimony of the prophets. Then he offers the chief solution on the basis of Hosea and Isaiah, after first intensifying the difficulty.
There were two questions: that the Gentiles received salvation, and that they received it without striving for it, that is, without taking care for it.
Again, concerning the Jews there were also two difficulties: the Jews did not attain salvation, and they did not attain it despite striving for it.
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Therefore the Apostle used the strongest expressions. He did not say that they had righteousness, but that they "attained" it. The most extraordinary and strange thing was that the seeker did not receive, while the non-seeker received.
By the word "seeker" the Apostle seems to gratify the Jews, but afterward he delivers a decisive blow. Since he could give a strong solution, he was not afraid to make the objection more unpleasant.
Therefore he does not speak about faith and the righteousness that arises from it. Rather, he proves that the Jews were defeated before faith and condemned by their own laws.
You, O Jew, Paul says, did not find even legal righteousness, because you transgressed the law and became subject to the curse.
But the Gentiles, who entered not with the help of the law but by another path, found a righteousness greater than legal righteousness, namely the righteousness from faith.
The Apostle said the same above: "If Abraham was justified by works, he has a boast, but not before God" (Rom 4:2). He was proving that righteousness from faith is higher than righteousness from the law.
Therefore, I said above that there were two difficulties, but now there are three questions. The Gentiles found righteousness, found it without seeking it, and found a righteousness greater than the righteousness from the law.
Opposite questions arise concerning the Jews: Israel did not find righteousness, did not find it despite seeking it, and did not find even the lesser righteousness.