But like Isaac, Jacob was also the child of promise [that the elder shall serve the younger]. Ishmael and Esau were children of the flesh, but Isaac and Jacob [Israel] were children of the seed of Abraham as well as children of God's promise.
or in other words, the flesh prevaileth nothing, it is the Spirit that saves.
And that Spirit says:
"Hath God cast away his people? God forbid. For I [Paul] also am an Israelite, of the seed of Abraham, the tribe of Benjamin" [Romans 11:1]
His people are not the disbelieving Jews whom Paul laments. His people are those God has graced with faith.
Tabsternager in post 228 states it clearly...
Notice in Romans 9:2-4, Paul talks about his sorrow over those of his own race:
9:2-4 "I have great sorrow and unceasing anguish in my heart. For I could wish that I myself were cursed and cut off from Christ for the sake of my brothers, those of my own race, the people of Israel.
Theirs is the adoption as sons; theirs the divine glory, the covenants, the receiving of the law, the temple worship and the promises."
Why do you suppose he was in such distress if "all Israel will be saved" (as dispensationalists interpret the phrase)?
Again, just two verses later:
Romans 9:6: "It is not as though God's word had failed. For not all who are descended from Israel are Israel."
Paul was distraught over those of his own race rejecting Christ and he made the point that their bloodline didn't make them Israel.
He casts away unbelievers, Esau was a prime example of that. He’s still mad at him