13 The woman, however, being in suspense, says to Him, “Lord, you have nothing to draw with, and the well is deep.” See how she understood the living water, simply the water which was in that fountain. “You would give me living water, and I carry that with which to draw, and you do not. The living water is here; how are you to give it me?” Understanding another thing, and taking it carnally, she does in a manner knock, that the Master may open up that which is closed. She was knocking in ignorance, not with earnest purpose; she is still an object of pity, not yet of instruction.
Source: Tractates on the Gospel of John (New Advent)