Jesus said to him,
He that is washed needs not except to wash his feet, but is clean completely: and you are clean, but not all.
All Commentaries on John 13:10 Go To John 13
Cyril of Alexandria
AD 444
He draws His illustration from a common incident of ordinary human life, and opportunely contrives the rebuke to the traitor, teaching the man both to repent of his purpose and to change himself to a better mind. For even if Christ's reproaches do not yet convict him of his meditated treachery, yet the saying must carry with it a stern significance. For in testifying to the perfect cleanness of some [but not all] of the disciples, He thereby makes the one who was not clean feel an uneasy suspicion, and points out the presence of a polluted one. For Christ graciously commends the cleanness of His other disciples, as shown by their willing joy in attending on Him continually, the hardship they underwent in following Him, their firmness in faith, and their fulness of love towards Him. On Judas, however, the reproach of his insatiable covetousness and the feebleness of his affection for our Lord Jesus the Christ are branding the ineffaceable stain, and steeping him in the pollution, of his incomparably hideous treachery. When therefore Christ says: Now ye are clean, but not all, though the language is obscure, yet it conveys a profitable rebuke to the traitor. For although He did not speak plainly, as we have just said, still in each man's heart conscience was sitting in judgment, pricking the sinner to the heart, and bringing home to the guilty one the force of the words according to their necessary meaning.
And notice how fully the conduct of Christ is expressive of a certain set purpose and of God-befitting forbearance. For if He had said plainly who it was that would betray Him, He would have made the other disciples to be at enmity with the traitor. Judas might thence perhaps have suffered some fatal mischief, and have undergone a premature penalty at the hands of one who was spurred on by pious zeal to prevent the murder of his Master by previously putting to death His would-be betrayer. Therefore, by merely giving an obscure hint, and then leaving the conviction to gnaw its way to the conscience, He proved incontestably the greatness of His inherent forbearance. For although He well, knew that Judas had no kindly feeling or wise consideration for His Master, but that he was full of the poison of devilish bitterness and even then devising the means whereby he might effect the betrayal, He honoured him in the same measure as the rest, and washed even his feet also, continually exhibiting the marks of His own love, and not letting loose His anger till He had tried every kind of remonstrance. For thou mayest perceive how this special characteristic also is peculiar to the Divine Nature. For although God knows what is about to happen, He brings His punishment prematurely on no man: but rather, after bearing with the guilty for the utmost length of needful time, when He sees them in no way profiting thereby, but rather remaining in their self-chosen evil ways, then at length He punishes them; showing it to be the actual result of their perverse folly, and not really an effect of His own counsel or of His will. For instance, Ezekiel on this account says: As I live, saith the Lord, I desire not the death of him that dieth, but rather that he should turn from his evil way and live. Therefore with long-suffering and forbearance our Lord Jesus the Christ still treats the traitor just as He does His other disciples, although the devil had already put into his heart to betray Him, (for this also the Evangelist was constrained to point out at the outset of the narrative;) and washes his feet, thus making his impious conduct absolutely inexcusable, so that his apostasy might be seen to be the fruit of the wickedness which was in him.
