This means that it is not the children of the flesh who are the children of God, but the children of the promise are counted as offspring. Romans 9:8
The children of God are those individuals who stand on the promise of God by faith and not by the works of our hands.
The old hymn says: “Standing on the promises of Christ our King through eternal ages let his praises ring glory in the highest I will shout and sing. Standing in the Promises of God”. We stand on the promises of God not in our own efforts. The promise of forgiveness and salvation is available to all through faith in Christ. Praise the Lord it is not based on our family lineage or great acts but on the promise revealed through Jesus Christ.
We give you all the glory and praise for we stand on the promises given to us through faith in Jesus Christ.