Acts 1:26

What lesson then, my brothers, did our Lord Jesus Christ wish to impress on his church, when it pleased him to have one castaway among the twelve, but this, that we should bear with the wicked and refrain from dividing the body of Christ?… Such was this man Judas, and yet he went in and out with the eleven holy disciples. With them he came even to the table of the Lord: he was permitted to converse with them, but he could not contaminate them. Both Peter and Judas partook of one bread, and yet what communion had the believer with the infidel? Peter's partaking was to life, but that of Judas to death. For that good bread was just like the sweet savor. For as the sweet savor, so also does the good bread give life to the good and bring death to the wicked. "For whoever eats unworthily eats and drinks judgment against himself": "judgment against himself," not against you. If, then, it is judgment against him, not against you, bear as one that is good with him that is evil, that you may attain the rewards of the good and not be hurled into the punishment of the wicked.

This saying, "I have chosen you twelve," may be understood in this way, that twelve is a sacred number. For the honor of that number was not taken away because one was lost, for another was chosen into the place of the one that perished. The number remained a sacred number, a number containing twelve. These twelve were to make known the Three [the Trinity] throughout the whole world, that is, throughout the four quarters of the world. That is the reason of the three times four. Judas, then, only cut himself off; he did not profane the number twelve. He abandoned his Teacher, but God appointed a successor to take his place.

He reproved them by saying, "Are there not twelve hours in the day? If any man walks in the day, he does not stumble." Follow me, if you do not wish to stumble: do not give counsel to me, from whom you ought to receive it. To what, then, refer the words "Are there not twelve hours in the day"? So as to point himself out as the day, he chose twelve disciples. If I am the day, he says, and you the hours, is it for the hours to give counsel to the day? The day is followed by the hours, not the hours by the day. If these, then, were the hours, what in such a reckoning was Judas? Was he also among the twelve hours? If he was an hour, he had light; and if he had light, how was the Day betrayed by him to death? But the Lord, in so speaking, foresaw not Judas himself but his successor. For Judas, when he fell, was succeeded by Matthias, and the twelvefold number preserved. It was not, then, without a purpose that the Lord chose twelve disciples, but to indicate that he himself is the spiritual Day. Let the hours then attend upon the Day, let them preach the Day, be made known and illuminated by the Day, and by the preaching of the hours may the world believe in the Day. And so in a summary way it was just this that he said, "Follow me, if you do not wish to stumble."

"And they gave forth their lots" (for the spirit was not yet sent), "and the lot fell upon Matthias: and he was numbered with the eleven Apostles." "And they gave them their lots." For they did not yet consider themselves to be worthy to be informed by some sign. And besides, if in a case where neither prayer was made, nor men of worth were the agents, the casting of lots so much availed, because it was done of a right intention, I mean in the case of Jonah; much more did it here. Thus, did he, the designated, fill up the company, complete the order: but the other candidate was not annoyed; for the apostolic writers would not have concealed that or any other failings of their own, seeing they have told of the very chief Apostles, that on other occasions they had indignation, and this not once only, but again and again. Let us then also imitate them. And now I address no longer every one, but those who aim at preferment. If thou believest that the election is with God, be not displeased. For it is with Him thou art displeased, and with Him thou art exasperated: it is He who has made the choice; thou doest the very thing that Cain did; because, forsooth, his brother's sacrifice was preferred, he was indignant, when he ought to have felt compunction. However, that is not what I mean here; but this, that God knows how to dispense things for the best.

Since they are not yet perfected, they learn who is worthy by lot and not by miracle. Yet it should not be faulted that it is done by lot. For if the lot had power concerning Jonah when rejected and profane men cast lots, (Jonah …