What then? If some did not believe or were unfaithful [to God], their lack of belief will not nullify and make invalid the faithfulness of God and His word, will it?

being fully convinced that God had the power to do what He had promised.

However, it is not as though God’s word has failed [coming to nothing]. For not all who are descended from Israel (Jacob) are [the true] Israel;

For not knowing about God’s righteousness [which is based on faith], and seeking to establish their own [righteousness based on works], they did not submit to God’s righteousness.

But what does it say? “The word is near you, in your mouth and in your heart”—that is, the word [the message, the basis] of faith which we preach—

For I will not [even] presume to speak of anything except what Christ has done through me [as an instrument in His hands], resulting in the obedience of the Gentiles [to the gospel], by word and deed,