So also the apostolic spirit could see in this prediction about the conversion of the first group the general conversion of all who live as Gentiles, whoever they may be according to the flesh.
Mercy and acceptance into the people are foretold for the Israelites not insofar as they are Israelites, but insofar as they abandon pagan ways.
If we generalize this, we obtain the following: what was promised to them may rightly be applied to all who abandon paganism, such as those who believed in the Lord and Savior.
Therefore our interpreters receive the prophetic words as though they were spoken directly about the Gentiles. Saint Chrysostom says, "The Apostle brought Hosea as witness, through whom God cries out and says, 'I will call those who were not My people My people, and her who was not beloved, beloved.'
Who, then, are 'not My people'? Clearly the Gentiles. Who is 'not beloved'? Again, the same. Yet it is said of them that they will be a people, beloved, and sons of God.
'There they shall be called sons of the living God,' the Apostle continues. If they say that this is spoken about those who believed from among the Jews, as Blessed Theodoret says, even then our interpretation stands.
If such a change occurred in a people who, after many benefactions, proved ungrateful, fell away, and even lost what made it a people, what prevents others from being called?
What prevents those who were alienated, not after being received, but because they were strangers from the beginning, from being vouchsafed the same mercies for their obedience?"
Ambrosiaster writes: "It is clear that this was foretold about the Gentiles. They formerly were not the people of God, but afterward, to the reproach of the Jews, they were vouchsafed mercy and called the people of God.
Those who formerly were not dear, after the rejection of the Jews, were vouchsafed adoption and became beloved. Thus, where they formerly were not called the people of God, there they began to be called sons of the living God.
For formerly they were nowhere called sons of God except in Judea or in Jerusalem, where the house of God was, as it is said in Psalm 75: 'God is known in Judah' (Ps 75:2).
Afterward, in the prophecy of Zechariah, God says, 'I will make Jerusalem a stone trampled by all nations' (Zech 12:3). Then there will be sons of God everywhere, and the house of God in every place, which is the Church.
Therefore the Lord said to the Jews, 'Therefore the Kingdom of God will be taken from you and given to a nation producing its fruits' (Mt 21:43)." Concerning the fact that not all Jews will be accepted into the promised Kingdom of salvation in Christ Jesus, the Apostle cites two prophecies, both from Isaiah the Prophet.