John Chrysostom
Why did he not ask Christ on his own behalf alone to give him someone in place of Judas? Or why do the Apostles not make the choice by themselves? Peter had now become better than he had been before. Thus one may answer the first question. As for why they ask to complete their assembly not simply, but through revelation, I will point out two reasons. The first is that they were occupied with another matter. The second is that this served as the greatest proof that Christ remained with them. Even while absent in visible form, He Himself chose, just as He did when He was with them. This was no small consolation for them. But see how Peter does everything by common consent, and does not manage anything arbitrarily or as a ruler.
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He did not simply say, "In place of Judas we choose such and such a man." Rather, to calm the disciples about what had happened, see how he begins his speech. This event had indeed caused them no small perplexity. That is not surprising. If even now many reason about it, what would they naturally have said then? "Men and brethren," he says. If the Lord called them brethren, then such an address was all the more fitting for Peter. Therefore he cries out in this way in the presence of all. Behold the dignity of the Church and its angelic condition. Then no one was separated from the others, neither man nor woman. I would wish the churches to be like this even now. Then no one was concerned with anything worldly. No one was anxious about a house. See how useful temptations are. See what a good thing afflictions are. "It was necessary that the Scripture be fulfilled, which the Holy Spirit foretold." He constantly consoles them with prophecy. Christ also does this on every occasion. In exactly the same way Peter shows that there is nothing strange in this event, but that it had already been foretold. "It was necessary," he says, "that the Scripture be fulfilled, which the Holy Spirit foretold by the mouth of David." He does not say, "David said," but, "the Spirit through him." Notice already, at the very beginning of the book, what teaching he uses. Do you see that I did not say in vain at the beginning of this work that this book depicts the ordering of the Spirit? "The Holy Spirit foretold by the mouth of David." See how he claims the prophet as his own and brings forward his name, knowing that it would be useful for them that this saying belonged to David and not to another prophet. "Concerning Judas, who became a guide." Here too note the man's philosophy. He does not revile or dishonor Judas. He does not say that Judas was a wicked man, and the most terrible of wicked men. He simply explains what happened. He does not even call him a betrayer. Rather, as far as possible, he tries to place the blame on others. Yet he does not accuse them strongly either. "Who became," he says, "a guide to those who arrested Jesus." Before indicating the place where this saying of David is found, he recalls the fate that befell Judas. In this way, by what is present, he confirms what is future and shows that Judas had already received punishment. "And the number of persons together was about one hundred twenty," it is said. There were, probably, the seventy disciples whom Christ Himself had chosen, as well as others among the most zealous in faith, such as Joseph and Matthias. There were also many women who followed Him and were always with Him.