До римлян 3:29

Is he the God of the Jews only? &c.--The way of salvation must be one equally suited to the whole family of fallen man: but the doctrine of justification by faith is the only one that lays the basis of a Universal Religion; this therefore is another mark of its truth.

The apostle, in this chapter, carries on his discourse concerning justification. He had already proved the guilt both of Gentiles and Jews. Now in this chapter, I. He answers some objections that might be made against what he had said about the Jews (Rom 3:1-8). II. He asserts the guilt and corruption of mankind in common, both Jews and Gentiles (Rom 3:9-18). III. He argues thence that justification must needs be by faith, and not by the law, which he gives several reasons for (Rom 3:19 to the end). The many digressions in his writings render his discourse sometimes a little difficult, but his scope is evident.

3:29-30 Paul uses the foundational Jewish commitment to monotheism to argue for universal access to God’s forgiveness. If there is only one God, then he is equally the God of both Jews and Gentiles. All people must be able to come to God on the same terms, through faith.