Paul declares, with an oath in Christ, that he has great sorrow and unceasing anguish in his heart for his brothers, so much that he could wish himself accursed and cut off from Christ for their sake. To the Israelites belong the adoption, the glory, the covenants, the law, the worship, the promises and the patriarchs, and from them, according to the flesh, comes the Christ, who is God over all, blessed forever.
Although most of Israel did not believe, God's word has not failed, for not all who are descended from Israel belong to Israel. The children of the promise are counted as offspring: God chose Isaac and not Ishmael, and before Jacob and Esau were born or had done anything good or bad, he said that the older would serve the younger, so that God's purpose of election might stand, not because of works but because of him who calls.
Paul asks whether there is injustice on God's part and answers no. God has mercy on whom he has mercy, and hardens whom he wills, as in the case of Pharaoh. To the objection of why God still finds fault, Paul recalls that the potter has the right over the clay. God endured with patience vessels of wrath prepared for destruction and made known the riches of his glory for vessels of mercy, whom he has called not only from the Jews but also from the Gentiles, as Hosea and Isaiah announced, and only a remnant of Israel will be saved.
Paul concludes that the Gentiles, who did not pursue righteousness, attained it by faith, while Israel, who pursued a law that would lead to righteousness, did not reach it, because they did not pursue it by faith but as if it were based on works. They stumbled over the stumbling stone, but whoever believes in him will not be put to shame.