John 15:1-3

Ver 1. I am the true vine, and my Father is the husbandman. 2. Every branch in me that bears not fruit he takes away: and every branch that bears fruit, he purges it, that it may bring forth more fruit. 3. Now you are clean through the word which I have spoken to you.

HILARY. He rises in haste to perform the sacrament of His final passion in the flesh (such is His desire to fulfill His Father's commandment) and therefore takes occasion to unfold the mystery of His assumption of His flesh, whereby He supports us, as the vine does its branches: I am the true vine.

AUG. He says this as being the Head of the Church, of which we are the members, the Man Christ Jesus; for the vine and the branches are of the same nature. When He says, I am the true vine, He does not mean really a vine; for He is only called so metaphorically, not literally, even as He is called the Lamb, the Sheep, and the like; but He distinguishes Himself from that vine to whom it is said, How you are turned into the degenerate plant of a strange vine to me (Jeremiah 11:21). For how is that a true vine, which when grapes are expected from it, produces only thorns?

HILARY. But He wholly separates this humiliation in the flesh from the form of the Paternal Majesty, by setting forth the Father as the diligent husbandman of this vine: And My Father is the husbandman.

AUG. For we cultivate God, and God cultivates us. But our culture of God does not make Him better: our culture is that of adoration, not of plowing: His culture of us makes us better. His culture consists in extirpating all the seeds of wickedness from our hearts, in opening our heart to the plow, as it were, of His word, in sowing in us the seeds of His commandments, in waiting for the fruits of piety.

CHRYS. And forasmuch as Christ was sufficient for Himself, but His disciples needed the help of the Husbandman, of the vine He says nothing, but adds concerning the branches, Every branch in Me that bears not fruit, He takes away. By fruit is meant life, i.e. that no one can be in Him without good works.

HILARY. The useless and deceitful branches He cuts down for burning.

CHRYS. And inasmuch as even the best of men require the work of the husbandman, He adds, And every branch that bears fruit, He purges it, that it may bring forth more fruit. He alludes here to the tribulations and trials which were coming upon them, the effect of which would be to purge, and so to strengthen them. By pruning the branches we make the tree shoot out the more.

AUG. And who is there in this world so clean, that he cannot be more and more changed? Here, if we say that we have no sin, we deceive ourselves. He cleans then the clean, i.e. the fruitful, that the cleaner they be, the more fruitful they may be. Christ is the vine, in that He said, My Father is greater than I; but in that He said, I and My Father are one, He is the husbandman; not like those who carry on an external ministry only; for He gives increase within.

Thus He calls Himself immediately the cleanser of the branches: Now you are clean through the word, which I have spoken to you. He performs the part of the husbandman then, as well as of the vine. But why does He not say, you are clean by reason of the baptism wherewith you are washed? Because it is the word in the water which cleans. Take away the word, and what is the water, which but water.

Add the word to the element, and you have a sacrament. Whence has the water such virtue as that by touching the body, it cleans the heart, but by the power of the word, not spoken only, but believed? For in the word itself the passing sound is one thing, the abiding virtue another. This word of faith is of such avail in the Church of God that by Him who believes, presents, blesses, sprinkles the infant, it cleanses that infant, though itself is unable to believe.

CHRYS. You are clean through the word which I have spoken to you, i.e., you have been enlightened by My doctrine, and been delivered from Jewish error.