Now you are clean through the word which I have spoken unto you.
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Cornelius a Lapide
AD 1637
Now ye are clean through the word, &c. This is the pruning-hook with which God the Father καθαίζει, i.e, purges and cleanses His apostles, that they may be καθαζὸι, i.e, pure and clean, as the word of Christ. For as S. Paul says (Heb. iv.), "The Word of God is living and powerful, and more penetrating than any two-edged sword, and reaching, even to the dividing of soul and spirit, and of the joints and marrow." The meaning then Isaiah , My word, i.e, My doctrine which I have taught you, that ye may obey and believe it, is that pruning-hook which has purged you from error and sins, and has made you clean, holy, and pleasing to God.
Christ is speaking especially of His speech after the Last Supper, which had immediately preceded. For, as Toletus rightly perceived, this discourse inflamed the hearts of the disciples, who were already bearing fruit in Christ, and purged them by grace and love that they should bring forth more fruit.
For by this discourse of Christ the Apostles were purged from a certain ignorance. For Peter knew not whither Jesus was going. Thomas knew not the way. Judas asked to see the Father. The Lord pruned away this ignorance. They were also purged from vain confidence. For to Peter, their chief, it was said, Thou shalt deny Me thrice. They were purified from a sort of carnal affection. For they were too much addicted to reliance upon the sensible presence of Christ, desiring always to possess it. But now they hear that the Lord is going away to the Father, and that they must remain. They were purged from faint-heartedness, which made them almost despair of their own salvation when Christ should have departed. There were many other imperfections which the Lord pruned from His disciples on this night of the supper.