Romans 3:9-10 What then? are we better than they? No, in no wise: for we have before proved both Jews and Gentiles, that they are all under sin; As it is written, There is none righteous, no, not one 

‘What then? are we better than they? No, in no wise’ Paul states here clearly that the Jews do not have a better claim to the gospel than Gentiles. This is the last Jewish part of the dialogue of Romans 3:1-9. Paul answers that they have no more claim before God than Gentiles. The Jew has asked nine questions in this dialogue (3:1, 3, 5, 7, 9). Paul has answered them in verses 3:2, 4, 6, 8, 9.

‘Before proved both Jews and Gentiles, that they are all under sin’ in his last answer Paul comes back to the main subject of this section (Romans 1:18-3:20). The sum of the proof of world guilt: The 40 sins and the 20-fold apostasy of the Gentile world (1:18-32); an indictment of the self-righteous Jews who condemned the Gentiles, but were guilty of the same sins (2:1-2); impenitence of both Jews and Gentiles proved them sinners (2:3-6); the refusal of both classes in obeying the gospel (2:7-11); failure of both classes in walking in the light (knowledge of the Word) received (3:12-16); the Jews were exceedingly sinful because of their failure to live up to the law and superior advantages (2:17-29); the Jews were deeper sinners because of seeking excuses for their sinfulness contrary to the law and their own high profession of godliness (3:1-9).

‘Under sin’ sin is a real force that dominates and enslaves (5:12-21).

‘As it is written, There is none righteous, no, not one’ this passage (3:10-18) is from several Old Testament books on the same subject. Romans 3:10-12 are from Psalms 14:2-3; 52:2-4; Ecclesiastes 7:20. Romans 3:13-18 are from Psalms 5:9-10; 10:7; 36:1-2; 140:3; Isaiah 59:7-8.

‘There is none righteous’ having stated (3:9) that he had already proved both Jews and Gentiles to be under sin, he now proceeds to clinch this argument by the Jewish Scriptures which they could not deny. ‘Righteous’ no one is righteous in himself.