John Chrysostom

"What then have we more than they? For we have proved both Jews and Gentiles, that they are all under sin. As it is written, There is none righteous, no, not one." He had accused the Gentiles, he had accused the Jews; it came next in order to mention the righteousness which is by faith. …

Homily on Romans 7 ↗

Theophylact of Ohrid

Having said above that the Jews have a certain advantage, because the law was entrusted and committed to them, he now proves that they have no advantage by their deeds. For, as those who did not preserve what was entrusted to them, they will be subjected to great condemnation. Therefore, although they had a certain advantage, as chosen by God, yet since by their deeds they dishonored the One who honored them and chose them, they not only no longer have any advantage, but will also be subjected to greater condemnation. …

Commentary on Romans ↗

Thomas Aquinas

After showing the Jews' advantage over the gentiles so far as God's blessings are concerned, the Apostle now rejects their vainglory, by which they preferred themselves to gentiles converted to the faith. First, he states his point; second, he proves it, at for we have charged. First, therefore, he says: I have asked what advantage has the Jew. The first is that God's words were delivered to them. What then shall we Jews say to converts to the faith? Do we excel them, namely, those gentiles converted to the faith? …

Commentary on Romans ↗