Rom 11:15

“"For if the casting away of them be the reconciling of the world, what shall the receiving of them be but life from the dead?" Yet this again condemns them, since, while others gained by their sins, they did not profit by other men's well doings. But if he asserts that to be their doing which necessarily happened, be not surprised: since (as I have said several times) it is to humble these, and to exhort the other, that he throws his address into this form. For as I said before, if the Jews had been cast away a thousand times over, and the Gentiles had not shown faith, they would never have been saved. But he stands by the feeble party, and gives assistance to the distressed one. But see also even in his favors to them, how he solaces them in words only. "For if the casting away of them be the reconciling of the world," (and what is this to the Jews?) "what shall the receiving of them be but life from the dead?" Yet even this was no boon to them, unless they had been received. But what he means is to this effect. If in anger with them He gave other men so great gifts, when He is reconciled to them what will He not give? But as the resurrection of the dead was not by the receiving of them, so neither now is our salvation through them. But they were cast out owing to their own folly, but it is by faith that we are saved, and by grace from above.”

“What was the occasion for the reception of the Gentiles but that they came to life because of the death of the Jews? Or it may mean from among the Jews that were dead, Christ and the apostles have become life to the Gentiles. Or perhaps if those whom Christ sets free from death contribute to your life.”

“Note how diplomatically Paul phrases his statements. On the one hand he teaches those who already believe not to think too highly of themselves, and on the other hand he extends a hand to those Jews who do not believe, showing them that they could obtain salvation through repentance. In the following [verses] he develops this theme more clearly.”

“If, he says, having been angered at them, He granted so much to others and made enemies into friends, what will He not grant when He receives them? Then there will be "life from the dead," that is, unending blessings; for He indicates these by the word "life." At the same time, he also hints at something more exalted, namely that just as the resurrection from the dead will not depend on the acceptance of the Jews, so too the salvation of others will not depend on them either, if they do not have faith. All of this he says seemingly in favor of the Jews, offering them a refreshing drink, as physicians often do with the gravely ill.”

“Then when he says, for if, he assigns the reason for his interest, namely, that the conversion of the Jews would contribute to the salvation of the gentiles. Hence he says, for if the loss of them, i.e., their unbelief and disobedience, as a slave is said to be lost when he flees from the care and obedience of his master: my people have been a lost flock (Jer 50:6). If, I say, the loss of the Jews occasions the reconciliation of the world, inasmuch as we have been reconciled to God through the death of Christ, what shall the receiving of them be, but life from the dead? I.e., that the Jews will be accepted again by God, as it says in Zechariah: I took unto me two rods (Zech 11:17). What, I say, will such an acceptance mean but that it will make the gentiles rise to life? For gentiles are the believers who will grow lukewarm: because wickedness is multiplied, most men's love will grow cold (Matt 24:12), or will fall away entirely, being deceived by the Antichrist. These will be restored to their primitive fervor after the conversion of the Jews. And as the gentiles were reconciled after their enmity, the Jews having fallen away, so after the conversion of the Jews, the end of the world being then imminent, there will be a general resurrection, through which men will return from the dead to immortal life.”

“This is why Paul worked so hard for the conversion of the Jews, since the handicap of their blindness will be removed at the time when their sin is paid for, so that they might receive the free exercise of their will.”