Why does Paul express sorrow for the Jews in Romans 9?

Paul's anguish for the Jews in Romans 9 stems from their zealous but misguided attempts to obtain righteousness through the law rather than through faith in Christ. Despite possessing numerous advantages, such as their heritage and the scriptures, they remained ignorant of the true righteousness that comes from God. Paul reflects a pastoral concern, wishing that he could exchange his own salvation for theirs, highlighting his deep love and burden for their spiritual condition. This sorrow indicates that true faith involves recognizing one's own shortcomings and the need for Christ's righteousness. It underlines the gravity of self-righteousness which ultimately leads to eternal separation from God, emphasizing the urgent need for the gospel's transformative power.