Romans 3:9

What then? are we better than they? No, in no way: for we have before proved both Jews and Greeks, that they are all under sin;
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Ambrosiaster

AD 400
Paul is saying: “Why go on talking like this? For we have shown by the examples given that all, Jews and Gentiles alike, are guilty and that the law is being pursued in vain.” For Paul first showed that the Gentiles are guilty according to the law of nature and also because they did not accept the law of Moses, for which reason their case is very dire indeed. Then he showed that the Jews were also guilty. While they appeared to be living under God’s law and defended their privilege by the merit of their ancestors, they in fact brought the grace of God into disrepute because they rejected the promise made to their ancestors. Commentary on Paul’s Epistles.

George Leo Haydock

AD 1849
What then do we Jews excel the Gentiles? He again turns his discourse against the Jews, by shewing that they have been sinners, as well as the Gentiles, notwithstanding the particular favours God had done to them, and not to the Gentiles: this he proves out of the psalms; and (ver. 19.) he shews, that these things were spoken of them, who were under the law. (Witham)

Thomas Aquinas

AD 1274
271. After showing the Jews’ advantage over the Gentiles so far as God’s blessings are concerned [n. 248], the Apostle now rejects their vainglory, by which they preferred themselves to Gentiles converted to the faith. First, he states his point; secondly, be proves it, there [v. 9b; n. 274] at For we have charged. 272. 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 141 the faith? Are we Jews any better off than Gentiles converted to the faith? For this was a matter discussed among them: "A dispute also rose among them, which of them was to be regarded as the greatest" (Lk 23:24). He answers this when he says, No, not at all. 273. But this seems to be at variance with an earlier statement (v. 2), which said that their advantage was much in every way. The gloss [of Lombard, col. 1356] explains that in the first statement the Apostle was thinking of the Jews in the time o...

Knowing this first, that no prophecy of the scripture is of any private interpretation - 2 Peter 1:20

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