Adam Clarke on Romans 3:29

Is he the God of the Jews only? - Do not begin to suppose that because you cannot be justified by the works of the law and God has in his mercy found out a new method of saving you, that therefore this mercy shall apply to the Jews exclusively. Is not God the maker, preserver, and redeemer, also of the Gentiles? Yes, of the Gentiles also, as much as of the Jews; for all have equally sinned and there is no reason, if God be disposed to show mercy at all, that he should prefer the one to the other; since they are all equally guilty, sinful, and necessitous.