28 Then, “The woman says unto Him, I know that Messias will come, who is called Christ: when He then has come, He will tell us all things. Jesus says unto her, I that speak with you am He.” She called her husband; he is made the head of the woman, and Christ is made the head of the man. Now is the woman constituted in faith, and ruled, as about to live rightly. After she heard this, “I that speak with you am He,” what further could she say, when the Lord Jesus willed to manifest Himself to the woman, to whom He had said, “Believe me?”
29. “And immediately came His disciples, and marvelled that He talked with the woman.” That He was seeking her that was lost, He who came to seek that which was lost: they marvelled at this. They marvelled at a good thing, they were not suspecting an evil thing. “Yet no man said, What seekest Thou, or why talkest Thou with her?”
30. “The woman then left her water-pot.” Having heard, “I that speak with you am He,” and having received Christ the Lord into her heart, what could she do but now leave her water-pot, and run to preach the gospel? She cast out lust, and hastened to proclaim the truth. Let them who would preach the gospel learn; let them throw away their water-pot at the well. You remember what I said before of the water-pot: it was a vessel with which the water was drawn, called hydria, from its Greek name, because water is hydor in Greek; just as if it were called aquarium, from the Latin. She threw away her water-pot then, which was no longer of use, but a burden to her, such was her avidity to be satisfied with that water. Throwing her burden away, to make known Christ, “she ran to the city, and says to those men, Come, and see a man that told me all things that ever I did.” Step by step, lest those men should get angry and indignant, and should persecute her. “Is this Christ? Then they went out of the city, and came to Him.”
31. “And in the meanwhile His disciples besought Him, saying, Master, eat.” For they had gone to buy meat, and had returned. “But He said, I have meat to eat which you know not of. Therefore said the disciples one to another, Hath any man brought Him anything to eat?” What wonder if that woman did not understand about the water? See; the disciples do not yet understand the meat. But He heard their thoughts, and now as a master instructs them, not in a round-about way, as He did the woman while He still sought her husband, but openly at once: “My meat,” says He, “is to do the will of Him that sent me.” Therefore, in the case of that woman, it was even His drink to do the will of Him that sent Him. That was the reason why He said, “I thirst, give me to drink;” namely, to work faith in her, and to drink of her faith, and to transplant her into His own body, for His body is the Church. Therefore He says, “My meat is to do the will of Him that sent me.”
32. “Say ye not, that there are yet four months, and then comes harvest?” He was aglow for the work, and was arranging to send forth laborers. You count four months to the harvest; I show you another harvest, white and ready. Behold, I say unto you, “Lift up your eyes, and see that the fields are already white for the harvest.” Therefore He is going to send forth the reapers. “For in this is the saying true, that one reaps, another sows: that both he that sows and he that reaps may rejoice together. I have sent you to reap that on which you have not labored: others have labored, and you are entered into their labor.” What then? He sent reapers; sent He not the sowers? Whither the reapers? Where others labored already. For where labor had already been bestowed, surely there had been sowing; and what had been sown had now become ripe, and required the sickle and the threshing. Whither, then, were the reapers to be sent? Where the prophets had already preached before; for they were the sowers. For had they not been the sowers, whence had this come to the woman, “I know that Messias will come”? That woman was now ripened fruit, and the harvest fields were white, and sought the sickle. “I sent you,” then. Whither? “To reap what you have not sown: others sowed, and you are entered into their labors.” Who labored? Abraham, Isaac, and Jacob. Read their labors; in all their labors there is a prophecy of Christ, and for that reason they were sowers. Moses, and all the other patriarchs, and all the prophets, how much they suffered in that cold season when they sowed! Therefore was the harvest now ready in Judea. Justly was the grain there said to be as it were ripe, when so many thousands of men brought the price of their goods, and, laying them at the apostles' feet, having eased their shoulders of this worldly baggage, began to follow the Lord Christ. Verily the harvest was ripe. What was made of it? Of that harvest a few grains were thrown out, and sowed the whole world; and another harvest is rising which is to be reaped in the end of the world. Of that harvest it is said, “They that sow in tears shall reap with joy.” But to that harvest not apostles, but angels, shall be sent forth. “The reapers,” says He, “are the angels.” That harvest, then, is growing among tares, and is awaiting to be purged in the end of the world. But that harvest to which the disciples were sent first, where the prophets labored, was already ripe. But yet, brethren, observe what was said: “may rejoice together, both he that sows and he that reaps.” They had dissimilar labors in time, but the rejoicing they shall enjoy alike equally; they shall receive for their wages together eternal life.
33. “And many Samaritans of that city believed on Him, because of the saying of the woman, who testified, He told me all that ever I did. And when the Samaritans came to Him, they besought Him that He would tarry with them; and He tarried there two days. And many more believed because of His word; and said to the woman, Now we believe, not because of your words; for we have heard Him ourselves, and we know that this is indeed the Saviour of the world.” This also must be slightly noticed, for the lesson has come to an end. The woman first announced Him, and the Samaritans believed her testimony; and they besought Him to stay with them, and He stayed there two days, and many more believed. And when they had believed, they said to the woman, “Now we believe, not because of your word; but we have come to know Him ourselves, and we know that this is indeed the Saviour of the world:” first by report, then by His presence. So it is today with them that are without, and are not yet Christians. Christ is made known to them by Christian friends; and just upon the report of that woman, that is, the Church, they come to Christ, they believe through this report. He stays with them two days, that is, gives them two precepts of charity; and many more believe, and more firmly believe, on Him, because He is in truth the Saviour of the world.
Source: Tractates on the Gospel of John (New Advent)