John Chrysostom
What, then, does Christ say? “The hour has come that the Son of Man should be glorified. Unless a grain of wheat falls into the ground and dies, it remains alone.” What does “the hour has come” mean? Earlier He had said, “Do not go into the way of the Gentiles,” and by this He restrained the disciples, so as to remove from the Jews every pretext for ingratitude. But since the Jews continued in stubbornness, while the Gentiles wished to come to Him, He says: the time has now come to go to the Passion, since all things have already been fulfilled. If we continue caring for the Jews despite their stubbornness, and do not admit the Gentiles despite their desire, this would be unworthy of our providential care.
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Therefore, since He intended to send His disciples to the Gentiles after the Cross, and meanwhile sees that the Gentiles themselves are coming to Him, He says: it is time to go to the Cross. He did not send them earlier, so that this might serve as testimony against the Jews. Until the Jews had rejected Him by their very deed, and until they had handed Him over to be crucified, He did not say, “Go therefore and make disciples of all nations,” Mt 28:19. On the contrary, He said: “Do not go into the way of the Gentiles,” Mt 10:5. And again: “I was not sent except to the lost sheep of the house of Israel.” And again: “It is not good to take the children’s bread and throw it to the dogs,” Mt 15:24, 26. But when they hated Him, and hated Him so much that they handed Him over to death, it was useless to continue occupying Himself with them while they rejected Him. They did indeed renounce Him, saying: “We have no king but Caesar,” Jn 19:15. Then He also left them, when they had left Him. For this reason He says: “How often would I have gathered your children together, and you would not,” Mt 23:37.