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;
All Commentaries on Romans 3:9 Go To Romans 3
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.
