John Chrysostom
He comforts them not only by this, but also by what has already happened. Yet he sets what happened later as though it had happened earlier, saying: "As regards the Gospel, they are enemies for your sake; but as regards election, they are beloved for the sake of the fathers."
So that the Gentile might not be proud and say, "See, I am before you. Speak to me not of what may happen, but of what has already happened," the Apostle restrains him by saying: "As regards the Gospel, they are enemies for your sake."
Because you were called, they became more obstinate. Yet even then God did not cut off your calling, but waits until all who are to believe from among the Gentiles come in. Then the Jews also will come.
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Then the Apostle gives the Jews another consolation, saying: "But as regards election, they are beloved for the sake of the fathers." What does this mean? Where they are enemies, punishment awaits them. Where they are beloved, the virtue of their ancestors will profit them nothing if they do not believe.
Yet, as I remarked before, the Apostle does not cease to comfort them with words, in order to draw them.