Romans Chapter 9 Vs. 8

 

God's Sovereign Choice

That is, They which are the children of the flesh, these are not the children of God: but the children of the promise are counted for the seed. Rom 9:8

children of the... Is a reference to Abraham’s other children by Hagar and Keturah who were not chosen to receive the national promises made to him.

but the children... Being justified freely by his grace through the redemption that is in Christ Jesus: Paul’s point is just as not all of Abraham’s descendants who belonged to the physical people of God, or national Israel – not all of those who are true children of Abraham through Isaac are the true spiritual people of God and enjoy the promises made to Abraham’s spiritual children.

Rom 3:25 Whom God hath set forth to be a propitiation through faith in his blood, to declare his righteousness for the remission of sins that are past, through the forbearance of God;

are counted for... Christ hath redeemed us from the curse of the law, being made a curse for us: for it is written, Cursed is every one that hangeth on a tree:

Gal 3:14 That the blessing of Abraham might come on the Gentiles through Jesus Christ; that we might receive the promise of the Spirit through faith.

To be a physical descendant of Abraham is not enough; one must be chosen by God (cf. “chosen” in Rom. 8:33) and must believe in Him (Rom. 4:3, Rom. 4:22-24).