The question is whether this water, which is the Holy Spirit, is called the gift of God. As we have already established that this water is the Holy Spirit, so elsewhere in the same Gospel we find that it is called the gift of God.
For the same Lord, speaking with the Samaritan woman at the well, said to her, “Give Me a drink.” When she answered that Jews have no dealings with Samaritans, Jesus answered her.
“If you knew the gift of God, and who it is who says to you, ‘Give Me a drink,’ perhaps you would have asked Him, and He would have given you living water” (Jn 4:10).
And the woman says, “Sir, You have nothing to draw with, and the well is deep. Where then will You get living water?” (Jn 4:11). And so on.
Jesus answered her, “Everyone who drinks of this water will thirst again. But whoever drinks of the water that I shall give him will never thirst. The water that I shall give him will become in him a spring of water flowing into eternal life” (Jn 4:13-14).
Therefore, since this water, as the Evangelist said, is the Holy Spirit, without doubt the Spirit is the gift of God. The Lord speaks of this here.
“If you knew the gift of God, and who it is who says to you, ‘Give Me a drink,’ perhaps you would have asked Him, and He would have given you living water” (Jn 4:10).
For what He says there, “Out of his belly shall flow rivers of living water” (Jn 7:38), He says elsewhere in another form: “It will become in him a spring of water flowing into eternal life” (Jn 4:14).
In ordinary speech, living water is water that flows from a spring. Water collected from rain in hollows or reservoirs is not called living water.
Even if it flows from a spring and then stagnates, gathered in some place, it is not called living water. This is not because the spring has dried up, but because its movement has been interrupted.
For example, if a road blocks a stream, it is no longer called living water. Only water drawn while flowing is called living water. Such was the water from this spring.
Finally, hear Who asked for drink. Jesus answered her, “If you knew the gift of God, and who it is who says to you, ‘Give Me a drink,’ you would have asked Him, and He would have given you living water.”
He asked for drink and promised to give drink. He is in need and ready to receive, and at the same time He is rich and ready to satisfy. “If you knew,” He says, “the gift of God.”
The gift of God is the Holy Spirit. But for now He carries on a hidden conversation with the woman and gradually enters her heart. Perhaps He is already instructing her.
For what could be sweeter and more gracious than this exhortation? “If you knew the gift of God, and who it is who says to you, ‘Give Me a drink,’ you would have asked Him, and He would have given you living water.”
So far He speaks in a way she does not understand. In ordinary speech, living water means water that flows from a spring.
Water collected through channels into containers and reservoirs is not called living water. Even if it flows from a spring and is gathered somewhere, it is not called living water if it is not replenished from the place where it flowed.
If its own course is interrupted, as though the path from the spring were blocked, it will not be called living water. That water is called living which is drawn while it does not cease to flow.
Such was the water in that spring. Why, then, did He promise what He Himself asked for?