This takes the argument one stage further, and places the obedient Gentile in such a position of superiority over the disobedient Jew that he may actually exercise judgment over him. Given the attitude that all Jews had towards Gentiles, and how they looked down on them as beneath them and inferior to them, this was a most galling truth, but it cannot be gainsaid.
For the Jew to be judged by the Gentile is a most painful state of affairs. This is not just the Gentile asserting himself into this position; this God commending him to carry out this task, and therefore it is God confirming in advance that the Gentile is accepted and Jew is rejected. What terrible miscalculations the Jew has made! How he has so unwisely relied on the wrong thing! And the same is true of all self-righteous people. We cannot rely on church membership, on baptism, acceptance by men, because all these things may be there, and yet we are not saved. It will be the height of shame for the self-righteous to be judged by the nobodies of this world and the those who they regarded with contempt. But judged they shall be, and God will use his saints in the final judgment as the ultimate humiliation of the proud.