John 6:70

"Have not I chosen you twelve, and one of you is a devil?" For since Peter said, "We believe," Jesus excepteth Judas from the band. In the other place Peter made no mention of the disciples; but when Christ said, "Whom say ye that I am?" he replied, "Thou art the Christ, the Son of the living God"; but here, since he said, "We believe," Christ with reason admitteth not Judas into that band. And this He did afar off, and long before the time, to check the wickedness of the traitor, knowing that He should avail nothing, yet doing His own part.

And remark His wisdom. He made not the traitor manifest, yet allowed him not to be hidden; that on the one hand he might not lose all shame, and become more contentious; and on the other, that he might not, thinking to be unperceived, work his wicked deed without fear. Therefore by degrees He bringeth plainer reproofs against him. First, He numbered him too among the others, when He said, "There are some of you that believe not," (for that He counted the traitor the Evangelist hath declared, saying, "For He knew from the beginning who they were that believed not, and who should betray Him;") but when he yet remained such, He brought against him a more severe rebuke, "One of you is a devil," yet made the fear common to them all, wishing to conceal him. And here it is worth while to enquire, why the disciples at this time said nothing, but afterwards were afraid and doubted, looking one upon another, and asking, "Lord, is it I?", when Peter beckoned to John to find out the traitor, by enquiring of their Teacher which was he. What is the reason? Peter had not yet heard, "Get thee behind me, Satan," wherefore he had no fear at all; but when he had been rebuked, and though he spoke through strong affection, instead of being approved of, had even been called "Satan," he afterwards with reason feared when he heard, "One of you shall betray Me." Besides, He saith not even now, "One of you shall betray Me," but, "One of you is a devil"; wherefore they understood not what was spoken, but thought that He was only reflecting upon their wickedness.

But wherefore said He, "I have chosen you twelve, and one of you is a devil"? It was to show that His teaching was entirely free from flattery. For that they might not think that He would flatter them, because when all had left Him they alone remained, and confessed by Peter that He was the Christ, He leadeth them away from such a suspicion. And what He saith is of this kind. "Nothing abasheth Me from rebuking the bad; think not that because ye have remained I shall choose to flatter you, or that because ye have followed Me I shall not rebuke the wicked. For neither doth another circumstance abash Me, which is much more powerful than this to abash a teacher. For he that remaineth affordeth a proof of his affection, while one that hath been chosen by a teacher, being rejected, attacheth to him a character for folly among senseless persons. Still neither doth this cause Me to refrain from My reproofs." This at least even now the heathen frigidly and senselessly urge against Christ. For God is not wont to make men good by compulsion and force, neither is His election and choice compulsory on those who are called, but persuasive. And that thou mayest learn that the calling compelleth not, consider how many of these who have been called have come to perdition, so that it is clear that it lieth in our own will also to be saved, or to perish.

Then said the Lord Jesus: "Have not I chosen you twelve, and one of you is a devil?" Therefore, should He have said, "I have chosen eleven:" or is a devil also chosen, and among the elect? Persons are wont to be called "elect" by way of praise: or was man elected because some great good was done by him, without his will and knowledge? This belongs peculiarly to God; the contrary is characteristic of the wicked. For as wicked men make a bad use of the good works of God; so, on the contrary, God makes a good use of the evil works of wicked men. How good it is that the members of the body are, as they can be disposed only by God, their author and framer! Nevertheless what evil use doth wantonness make of the eyes? What ill use doth falsehood make of the tongue? Does not the false witness first both slay his own soul with his tongue, and then, after he has destroyed himself, endeavor to injure another? He makes an ill use of the tongue, but the tongue is not therefore an evil thing; the tongue is God's work, but iniquity makes an ill use of that good work of God. How do they use their feet who run into crimes? How do murderers employ their hands? And what ill use do wicked men make of those good creatures of God that lie outside of them? With gold they corrupt judgment and oppress the innocent. Bad men make a bad use of the very light; for by evil living they employ even the very light with which they see into the service of their villanies. A bad man, when going to do a bad deed, wishes the light to shine for him, lest he stumble; he who has already stumbled and fallen within; that which he is afraid of in his body has already befallen him in his heart. Hence, to avoid the tediousness of running through them separately, a bad man makes a bad use of all the good creatures of God: a good man, on the contrary, makes a good use of the evil deeds of wicked men. And what is so good as the one God? Since, indeed, the Lord Himself said, "There is none good, but the one God." By how much He is better, then, by so much the better use He makes of our evil deeds. What worse than Judas? Among all that adhered to the Master, among the twelve, to him was committed the common purse; to him was allotted the dispensing for the poor. Unthankful for so great a favor, so great an honor, he took the money, and lost righteousness: being dead, he betrayed life: Him whom he followed as a disciple, he persecuted as an enemy. All this evil was Judas's; but the Lord employed his evil for good. He endured to be betrayed, to redeem us. Behold, Judas's evil was turned to good. How many martyrs has Satan persecuted! If Satan left off persecuting, we should not to-day be celebrating the very glorious crown of Saint Laurence. If then God employs the evil works of the devil himself for good, what the bad man effects, by making a bad use, is to hurt himself, not to contradict the goodness of God. The Master makes use of that man. And if He knew not how to make use of him, the Master contriver would not have permitted him to be. Therefore, He saith, "One of you is a devil," whilst I have chosen you twelve. 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: because they were to make known 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, not profaned the number twelve: he abandoned his Teacher, for God appointed a successor to take his place.

(Tr. xxvii. s. 10) He was elected to be an involuntary and unconscious instrument of producing the greatest good. For as the wicked turn the good works of God to an evil use, so reversely God turns the evil works of man to good. What can be worse than what Judas did? Yet our Lord made a good use of his wickedness; allowing Himself to be betrayed, that He might redeem us. In, Have I not chosen you twelve, twelve seems to be a sacred number used in the case of those, who were to spread the doctrine of the Trinity through the four quarters of the world. Nor was the virtue of that number impaired, by one perishing; inasmuch as another was substituted in his room.