Not as though the word of God has taken no effect. For they are not all Israel, who are of Israel:
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Diodorus of Tarsus
AD 390
Because the promises which had been given to the Jews had been transferred to the Gentiles, Paul wanted to avoid the charge that God had lied about his promises, and so he shows how God remains faithful. The Scriptures make it clear that it was not those who were Israelites according to the flesh but those who by their godliness showed that they were worthy to be Israelites who were called children of Abraham. .
Not as though the word of God hath failed in his promises made to Abraham, and the patriarchs. The Jews pretended that the promises were made to them only, and to those that were of their race, and that the Gentiles were not to partake of them. St. Paul shows them their mistake, by telling them who are to be esteemed the true children of Abraham, and of the patriarchs, according to the promises which God made, and who are not. (Witham)
All are not Israelites Not all, who are the carnal seed of Israel, are true Israelites in God's account: who, as by his free grace he heretofore preferred Isaac before Ismael, and Jacob before Esau, so he could, and did by the like free grace, election, and mercy, raise up spiritual children by faith to Abraham and Israel, from among the Gentiles, and prefer them before the carnal Jews. (Challoner)
Neither are all they, who are of the seed of Abraham, his true spiritual children, to whom these promises were made: nor are all they who are descended from...
After asserting the greatness of the Jews [n. 735], the Apostle now shows that it did not refer to those who descended according to the flesh from the ancient patriarchs but to the spiritual progeny chosen by God. First, he shows that this greatness arises from God's selection; secondly, that this selection applies generally to Jew and Gentiles [v. 24; n. 796]. In regard to the first he does two things: first, he shows how from God's choice men obtain spiritual greatness; secondly, he raises a question about the justice of God's choice [v. 14; n. 765]. In regard to the first he does two things: First, he states his proposition; secondly shows it [v. 7b; n. 751]. Concerning the first, he does two things. First he sets out the firmness of the divine election; second, he shows in whom it is accomplished [v. 6b; n. 750]. 369 749. First, therefore, he says: It has been stated that the promises, the adoption of sons, and glory referred to people whose fall is to me a source of great sadness ...
