1 Cor 3:9 for we are God's fellow-workers; you are God's field…

God’s Field - It properly denotes a "tilled" or "cultivated field;" and the idea is that the church at Corinth was the field on which GOD had bestowed the labour to produce fruit.

Admonishes (1 Cor 3: 1-8) - Jealousy and quarrelling

Brothers, I could not address you as spiritual but as worldly-- mere infants in Christ. I gave you milk, not solid food, for you were not yet ready for it. Indeed, you are still not ready. You are still worldly. For since there is jealousy and quarrelling among you, are you not worldly? Are you not acting like mere men? For when one says, "I follow Paul," and another, "I follow Apollos," are you not mere men? What, after all, is Apollos? And what is Paul? Only servants, through whom you came to believe-- as the Lord has assigned to each his task. I planted the seed, Apollos watered it, but God made it grow. So neither he who plants nor he who waters is anything, but only God, who makes things grow. The man who plants and the man who waters have one purpose, and each will be rewarded according to his own labour. For we are God's fellow-workers; you are God's field

The word "carnal" here sarkinois is not the same which in 1 Cor 2:14, is translated "natural" psuchikos. "That" refers to one who is unrenewed, and who is wholly under the influence of his sensual or animal nature, and is no where applied to Christians. "This" is applied here to Christians-but to those who have much of the remains of corruption, babes in Christ.

"The works of the flesh are hatred, variance, emulations, wrath, strife, seditions, envyings" (Gal 5:20-21); and these they had evinced in their divisions; and Paul knew that their danger lay in this direction, and he therefore addressed them according to their character. Paul applies the word to himself (Rom 7:14), "for I am carnal;" and here it denotes that they were as yet under the influence of the corrupt passions and desires which the flesh produces.

The envy here referred to, was that which arose from the superior advantages and endowments which some claimed or possessed over others. Envy everywhere is a fruitful cause of strife. Most contentions in the church are somehow usually connected with envy. (Barnes)

Abidance (Matt 13:18-23) – Hear the Word and understand

"Listen then to what the parable of the sower means: When anyone hears the message about the kingdom and does not understand it, the evil one comes and snatches away what was sown in his heart. This is the seed sown along the path. The one who received the seed that fell on rocky places is the man who hears the word and at once receives it with joy. But since he has no root, he lasts only a short time. When trouble or persecution comes because of the word, he quickly falls away. The one who received the seed that fell among the thorns is the man who hears the word, but the worries of this life and the deceitfulness of wealth choke it, making it unfruitful. But the one who received the seed that fell on good soil is the man who hears the word and understands it. He produces a crop, yielding a hundred, sixty or thirty times what was sown."

The Samaritan woman is in a physical realm while Jesus is in a spiritual realm. Jesus takes the physical and leads her to the spiritual. She will come to a point where she knows that the person she is in conversation none but Messiah Himself (Vs 25-26) What amazes me is this woman in conversation with the Lord was thinking of the physical but when she begins to know that this could be the Messiah the spiritual takes over the physical (John 4:28-29 Then, leaving her water jar, the woman went back to the town and said to the people, "Come, see a man who told me everything I ever did. Could this be the Christ?")

When Jesus asks his disciples to open their eyes and to look at the field probably He was looking at the Samaritans coming toward Him, they are not yet God field’s but soon (it is ripe for harvest) they will be. How they will become God’s field? The text says it’s because of the testimony of this woman.