John Chrysostom
In Scripture, the grace of the Holy Spirit is sometimes called fire and sometimes water. This shows that such names express not His essence, but only His operation, because the Spirit, as an invisible and simple essence, is not composed of different substances.
Matthew calls Him fire when he says, “He will baptize you with the Holy Spirit and fire” (Mt 3:11). Christ calls Him water: “Out of his belly shall flow rivers of living water.”
“He said this about the Spirit, whom those who believed in Him were to receive” (Jn 7:38-39). So also, when speaking with the woman, He calls the Spirit water.
“Whoever drinks of the water that I shall give him shall never thirst.” The Spirit is called fire to signify the warmth of grace that He kindles and the destruction of sins.
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He is called water to express the purity and renewal given by Him to the souls that receive Him. And rightly so.
Like a garden blooming with many fruitful and ever-green trees, He prepares the zealous soul. He does not allow it to feel either sorrow or the assaults of Satan, but easily quenches the fiery darts of the evil one.
But notice the wisdom of Christ, how little by little He raises the woman. He did not say to her from the beginning, “If you knew who it is who says to you, ‘Give Me a drink.’”
But when He gave her occasion to call Him a Jew and provoked her reproach, then, repelling the accusation, He said this.
Then, having said, “If you knew who it is who says to you, ‘Give Me a drink,’ you would ask Him,” He compelled her by the promise of something great to remember the forefather.
In this way He gives the woman sight. Then, when she objected, “Are You greater than our father Jacob?” He did not say, “Yes, I am greater than he.”
That might have seemed to her mere vainglory, since no proof of it had yet appeared. Instead, He prepares her for this precisely by what He says.
He does not simply say, “I will give you water.” First He shows the insufficiency of Jacob's water, and then He exalts the significance of His own water.
He wishes to show, from the nature of the gifts themselves, the distance and difference between the givers, and His own superiority over Jacob.
If you marvel that Christ spoke in this way to Jacob, because Jacob gave this water, what will you say if I give you an even better one?
You have already anticipated Me by confessing that I am greater than Jacob, when you objected to Me, “Are You greater than our father Jacob?” You said this because I promise to give better water.
When you receive this water, you will fully acknowledge Me as greater than he. Do you see the impartial judgment of the woman, who judges the forefather and Christ by their works?
The Jews did not act this way. Even when they saw Him casting out demons, they not only did not consider Him greater than the forefather, but even called Him demon-possessed.
The woman bases her judgment precisely on what Christ wishes, that is, on proof from His works. For He Himself based the judgment concerning Himself on this, saying thus.
“If I do not do the works of My Father, do not believe Me. But if I do them, even if you do not believe Me, believe My works” (Jn 10:37-38).
By exactly this path the woman also comes to faith. Therefore Christ, hearing her words, “Are You greater than our father Jacob?” leaves aside the discussion about Jacob and speaks about the water.
“Everyone who drinks of this water,” He says, “will thirst again.” He makes this comparison between the two waters, not disparaging one, but only showing the superiority of the other.
He does not say that that water is worthless, means nothing, and deserves contempt. Rather, He affirms what the very nature of that water also testifies.
“Everyone who drinks of this water will thirst again. But whoever drinks of the water that I shall give him shall never thirst” (Jn 4:13-14).