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.

139. In ancient times those who were guided as celestial people by the Lord were said 'to dwell alone', for the reason that evil forces, or evil spirits, were infesting them no longer. This was also represented in the Jewish Church by their dwelling alone after the nations had been driven out. For this reason several times in the Word the Lord's Church is described as 'alone', as in Jeremiah,

Rise up, go up against a nation at ease that dwells securely. It has no gates or bars; they dwell alone. Jeremiah 49:31.

In the prophecy of Moses,

Israel dwelt securely, alone. Deuteronomy 33:28.

And plainer still in Balaam's prophecy,

See, a people, it dwells alone, and is not reckoned among the nations. Numbers 23:9.

Here 'nations' stands for evils. These descendants of the Most Ancient Church did not wish to dwell alone; they did not wish to be a celestial man, that is, to be guided as a celestial man by the Lord, but to be among the nations, as also did the Jewish Church. And since this was what they desired it is said, 'It is not good that the man should be alone'. Indeed when this is what a person desires, he is already under the influence of evil, and his wish is granted.