Throughout Romans 9, Paul systematically shows that God’s sovereign election has been in force from the very beginning. Reviewing the history of Israel, Paul shows that God chose Isaac over Ishmael and Jacob over Esau. Just in case anyone thinks that God was choosing these individuals based on the faith or good works they would do in the future, he adds, “Though they [Jacob and Esau] were not yet born and had done nothing either good or bad – in order that God’s purpose of election might continue, not because of works but because of him who calls” (Romans 9:11).
Paul anticipates those who might accuse God of being unjust this accusation in v. 14, stating plainly that God is not unjust in any way. “I will have mercy on whom I have mercy, and I will have compassion on whom I have compassion” (Romans 9:15). God is sovereign over His creation. He is free to choose those whom He will choose, and He is free to pass by those whom He will pass by. The creature has no right to accuse the Creator of being unjust. The very thought that the creature can stand in judgment of the Creator is absurd to Paul, and it should be so to every Christian, as well. The balance of Romans 9 substantiates this point.