A "field" in the Bible usually represents the Lord's church, and more specifically the desire for good within the church. It's where good things start, take root, and grow. When you have a desire to be a good person and to do good things, the natural first questions are "What does that mean?", "What should I do?", "What can I do?". You look for ideas, concepts, direction. Once you figure out something you want to do or a change you want to make in yourself, you seek specific knowledge. If you want to volunteer at a food pantry, say, you'd need to know whom to call, when they need help, where to go, what to bring. Armed with that knowhow, you're ready to get to work. That process could be compared to food production. You start with a field -- which is that desire to be good. Then you plant seeds -- those ideas and concepts. Those seeds sprout into plants -- the specific facts and knowledge needed for the task (easily seen in the food pantry example, but also true with deeper tasks like "being more tolerant of my co-workers" or "taking more time for prayer," or "consciously being a more loving spouse"). Finally, those plants produce food -- the actual good thing that you go and do. The Writings also say that in a number of cases a "field" represents the doctrine, or teachings, of the church. This sounds markedly different. The desire for good is emotional, a drive, a wanting; doctrine is a set of ideas. But for a church to be true, its doctrine must be centered on a desire for good, and must lead people toward doing what is good. So sound doctrine is actually closely bound up with the desire for good.

2971. 'The field and the cave which was in it' means as regards the good and truth of faith. This is clear from the meaning of 'the field' as the Church and also good itself which constitutes the Church (that which is celestial - or good that stems from love to the Lord and charity towards the neighbour - is compared to 'the ground' as well as to the field, and is actually called these, because that which is celestial - or good - is the recipient of the truths of faith; and these truths are compared to and are also actually called 'seeds'); and from the meaning of 'a cave' as the truth of faith which is enveloped in obscurity, dealt with in 2935. It is said to be in obscurity because it is with spiritual people, see 1043, 2708, 2715.

2935. 'Let him give me the cave of Machpelah [which is his]' means the obscurity of faith [that was theirs]. This is clear from the meaning of 'a cave' as obscurity, dealt with in 2463, and from the meaning of 'Machpelah' as faith which is enveloped in obscurity. The reason 'a cave' means obscurity is that it is a place filled with darkness. When reference is made to a mountain cave - as in Genesis 19:30, where it is said that Lot lived in a mountain cave - obscurity as regards good is meant, but when reference is made to the cave in the field of Machpelah obscurity as regards truth is meant. Here, because the expression 'the cave of Machpelah' is used - Machpelah being the field at the end of which the cave was situated - an obscurity as regards truth, or what amounts to the same, as regards faith is meant. From this it is also evident that Machpelah is faith which is enveloped in obscurity.

[2] Those who are being regenerated and becoming spiritual are very much in obscurity as regards truth. With them good from the Lord is indeed flowing in, but truth less so. Consequently a parallelism and correspondence exists with man between the Lord and good, but not between Him and truth, see 1832. The chief reason for this is that men do not know what good is, and if they did know they would still not believe it at heart. And as long as their good is enveloped in obscurity, so too is their truth, for it is from good that all truth springs. Or to be more explicit, the idea that the Lord is Good itself, and that everything which in itself is a manifestation of love to Him and of charity towards the neighbour is good, and that everything which declares and confirms this is truth, they do not know except in an extremely obscure way. Indeed they even entertain doubts, and allow reasonings to enter in against those considerations. And as long as their state is such, the light of truth from the Lord cannot flow in. Indeed they think of the Lord as they do of another human being and not of Him as God; and they model their idea of love to Him on some worldly kind of love. What genuine affection that stems from charity towards the neighbour is they scarcely know at all, or even what charity is and what the neighbour is. Yet these are essentials. From this one may recognize the great obscurity in which spiritual people are and which is all the greater before regeneration has taken place, which state is the subject here.