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.

302. Verse 2. And I saw a strong angel proclaiming with a great voice, signifies exploration by the influx of the Lord into heaven. This is evident from the signification of a "strong angel," as being heaven (of which presently); also from the signification of "proclaiming with a great voice," as being exploration by the influx of the Lord, namely, exploration whether anyone is able to know the states of life of all in heaven and on the earth in general and in particular, for this is what is here treated of. This is signified by "proclaiming," and the influx of the Lord is signified by "a great voice;" for "voice," in reference to the Lord, signifies every truth of the Word, of doctrine, and of faith from Him; and in reference to heaven and the church, it signifies every thought and affection thence; and since everything true and good that angels in heaven and men in whom the church is, think and are affected by, is from the influx of the Lord, this is what is here signified by "a great voice." For it is well known, that no one from the love of good can be affected by good, and from the love of truth can think truth, of himself, but that this flows in from heaven, that is, through heaven from the Lord; and because this is so, "a great voice" signifies the influx of the Lord. (That "voice" in the Word signifies the truth of the Word, of doctrine, and of faith, also everything announced in the Word, see above, n. 261, and Arcana Coelestia 3563, 6971, 8813, 9926; and that it signifies the interior affection of truth and good, and thought therefrom, n. 10454) A "strong angel" signifies heaven because the whole angelic heaven before the Lord is as one man, or as one angel, likewise each society of heaven; therefore by "angel" in the Word an angel is not meant, but an entire angelic society, as by "Michael," "Gabriel," "Raphael." Here, therefore, "a strong angel proclaiming with a great voice" signifies the influx of the Lord into the whole heaven. That it is into the whole heaven is clear from what follows, for it is said, "And no one was able, in heaven nor upon the earth, neither under the earth, to open the book and to look thereon." (That "angels" in the Word mean entire societies of heaven, and in the highest sense the Lord in respect to Divine truth proceeding, see above, n. 90, 130, 200; and that The Whole Heaven before the Lord is as One Man, or as One Angel, and also every Society of Heaven, see in the work on Heaven and Hell 59-87.)