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.

1044. 'And it will be for a sign of the covenant between Me and the earth' means a token of the Lord's presence in charity, 'the earth' here being a person's proprium. This is clear from what has been stated already. That 'the earth' means a person's Proprium is clear from the internal sense and from the whole train of thought. Above it was stated that 'this is the sign of the covenant between Me and you and every living soul that is with you' meant whatever has been regenerated; but here the wording is different - 'it will be for a sign of the covenant between Me and the earth'. From this, and also from the repetition of 'sign of the covenant', it is evident that something different is meant here, and indeed that 'the earth' is that which has not been regenerated, and which is incapable of being, namely the will part of a person's proprium.

[2] When somebody is regenerate he belongs to the Lord so far as the understanding Part of his mind is concerned but belongs to himself so far as the will part of it is concerned. These two parts in the spiritual man are opposed to each other. But although the will part of a person's proprium is opposed, its continuing presence is nevertheless inevitable. Indeed all the obscurity in the understanding part, that is, all the thickness of his cloud, originates there. It is constantly flowing in from there, and in the measure it flows in so the cloud in the understanding part thickens; but in the measure it is taken away, the cloud thins out. This is why 'the earth' here means a person's proprium. That 'the earth' means the bodily part of man's nature as well as having many other meanings has been shown already.

[3] The relationship between those two parts is like two parties who were first of all joined together by a covenant of friendship - as will and understanding were in the member of the Most Ancient Church - and then the friendship was broken off and hostility arose, as happened when man corrupted totally the will part of him. After that, when the covenant is renewed, the hostile part presents itself as though the covenant were with it. But no covenant is made with it because it is utterly opposed and contrary. It is made instead with that which flows in from it, as has been stated, that is, with the understanding part of the proprium. The sign or token of the covenant is this, that to the extent the Lord is present in the understanding part of the proprium the will part of it will be taken away. The relationship between the two is just like that of heaven and hell. The understanding part of a regenerate person, by virtue of the charity in which the Lord is present, is heaven, while the will part of him is hell. To the extent the Lord is present in heaven, hell is removed; for when he subsists from himself man is in hell, but when he does so from the Lord he is in heaven. Man is constantly being raised up from hell into heaven, and so far as he is raised up his hell is taken away from him. The sign or token therefore that the Lord is present rests in the fact that man's own will is taken away. The possibility of that removal is achieved by means of temptations and many other means of regeneration.