Hos 2:23

“Next the promise of God is said for those who hear; if they do what is "commanded: And you will be my people and I will be your God." Not everyone who says they are a people of God are "a people" of God. Hence, that people who were proclaimed to be a people of God heard, "You are not my people," in the passage, "Therefore you are not my people." And it has been said to that people you are "not my people." Elsewhere this people was called a "people," for "they have provoked me to jealousy with what is not God"—he speaks concerning the former—"they have provoked me with their idols. So I will provoke them to jealousy with those who are not a people, with a senseless nation I will provoke them."”

“And the holy people inherited an eternal kingdom; the holy people who were chosen instead of the people. For "he provoked them to jealousy with a people that was not a people. And with a foolish people he angered them." For even if one has served the heathen, as soon as ever he draws near to the covenant of God, he is set free. The Gentiles are the new people chosen by God to replace the people of the old covenant as foretold by the prophet.”

“And not only is the operation of the Father, Son, and Holy Spirit everywhere one but also there is one and the same will, calling, and giving of commands, which one may see in the great and saving mystery of the Church. For as the Father called the Gentiles to the Church, saying: "I will call her My people which was not My people, and her beloved who was not beloved;" and elsewhere: "My house shall be called a house of prayer for all nations," so, too, the Lord Jesus said that Paul was chosen by Him to call forth and gather together the Church, as you find it said by the Lord Jesus to Ananias: "Go, for he is a chosen vessel unto Me to bear My name before all nations." As, then, God the Father called the Church, so, too, Christ called it, and so, too, the Spirit called it, saying: "Separate Me Paul and Barnabas for the work to which I have called them." "So," it is added, "having fasted and prayed, they laid hands on them and sent them forth. And they, being sent forth by the Holy Spirit, went down to Seleucia." So Paul received the apostleship by the will not only of Christ, but also of the Holy Spirit, and hastened to gather together the Gentiles.”

“Here to prevent their saying that you are deceiving us here with specious reasoning, he calls Hosea to witness, who cries and says, "I will call them my people, who were not my people." Who then are the not-people? Plainly, the Gentiles. And who are the not-beloved? The same again. However, he says, they shall become at once people, and beloved, and children of God. "For even they shall be called," he says, "the children of the living God." But if they should assert that this was said of those of the Jews who believed, even then the argument stands. For if with those who after so many benefits were hardhearted and estranged and had lost their being as a people, so great a change was wrought, what is there to prevent even those who were not estranged after being taken to him but were originally aliens, from being called, and, provided they obey, from being counted worthy of the same blessings? Having then done with Hosea, he does not content himself with him only, but also brings Isaiah in after him, sounding in harmony with him.”

“"You who were once not a people but now are the people of God, who did not seek after mercy but now have received mercy." By these verses he indicates clearly that he has written this letter to those who had come from the Gentiles to the faith, who were once separated from the way of life of the people of God but then through the grace of faith were joined to his people and obtained the mercy that they did not know how to hope for. He takes them, however, from the prophet Hosea, who predicted the calling of the Gentiles and said, "I shall call [those who were] not my people my people and [those who did] not receive mercy [a people] having received mercy. And it will be in the place where it was said, 'You are not my people,' there they will be called sons of the living God."”