en_tn_condensed/rom/09/08.md

the children of the flesh are not

Here "children of the flesh" is a metonym that refers to the physical descendants of Abraham. Alternate translation: "not all of Abraham's descendants" (See: rc://en/ta/man/translate/figs-metonymy)

children of God

This is a metaphor that refers to people who are spiritual descendants, those who have faith in Jesus. (See: rc://en/ta/man/translate/figs-metaphor)

children of the promise

This refers to people who will inherit the promises that God gave to Abraham.