Romans 3:9

Romans 3:9. 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;

Read the earlier chapters of this Epistle, chapters that are enough to make the heart sick to read them, and to make the head ache with the memory of them, and when you have read them, you will say that Paul has proved that both Jews and Gentiles are under sin.