The concept of a "church" in the Writings is both complex and beautifully organic, linked with teachings on the nature of the Lord and the resulting nature of mankind.

The Writings say that the Lord, in His essence - His actual substance - is perfect, infinite love, a love that powered creation, that is the ultimate source of reality, and that sustains reality constantly. That love is expressed in form as perfect, infinite wisdom, which gave form to creation and gives form to reality.

Deep stuff! You can read more about that elsewhere, but what matters here is that all of creation, from the smallest elements to the whole of the universe, reflects that same structure. It's present in nature itself, powered by the heat (love) and light (wisdom) of the sun. It's present in the essential forms of life, with plants (which are rooted; which change little; which are unfeeling; which are powered by light) representing elements of wisdom and animals (warm, feeling, mobile, ever-changing, powered by heat) representing forms of love. It's present in the near-universal division into male (wisdom) and female (love) aspects of plants and animals alike.

That structure is also in each of us. In common language we might call these our hearts and our minds - what we want and what we think. The Writings commonly talk of them as good (love; what we want in our hearts) and truth (wisdom; what we know in our minds) or as will (heart) and understanding (mind). Not only do these elements define us, they are also key to our spiritual fates. We can use them to accept the Lord's love, come into the good of life and ultimately go to heaven. We can also use them to reject the Lord's love and trot off to hell.

And there are further layers. The Writings say that all human societies are in human form, with functions analogous to the human body. This is true from small groups like families to large companies to entire nations and ultimately to both the entire human race in this world and the entirety of heaven in the next.

Among the most important human societies are, naturally, churches. Since the concept of a "church" is based on the human form, though, churches as referred to in the Writings can take many forms. At one end of the scale, any one person who has true ideas of right and wrong and lives by them is a church himself or herself. At the other end of the scale, all those in the whole world who believe in love of the neighbor – and act from that belief – collectively make up one church.

Many other varieties lie between those two extremes, but most references to "church" in the Writings mean the community of those who have the Word, know the Lord, and follow His commandments. These people have access to the best possible truth and deepest possible understanding about the nature of the Lord and what He wants from us.

Such a church plays a vital role: The Lord works through it to get ideas about being good into people's minds and the desire to be good into the inner recesses of their hearts, reaching far beyond that church itself to touch everyone in the world. In fact, the Writings say there is in essence a marriage between the Lord and the church, with the church in the role of the bride and wife, producing true ideas and good desires the way a wife produces children.

To protect this function, the Lord has made sure that throughout history (and a good bit of prehistory) there has always been a church filling this role.

The first of these was the Most Ancient Church, represented by Adam; it was inspired by love of the Lord. The second was the Ancient Church, represented by Noah; it was inspired by love of the neighbor and knowledge of the Lord. The third was the Israelitish Church, which had no interior love of good but preserved ideas of the Lord. The fourth was the primitive Christian church, which had a new, more direct understanding based on the Lord's teachings. The fifth, according to the Writings, is to be based on the deeper understanding offered through the Writings and their explanations of the Bible.

There is much more that could be said, but we'll just emphasize one other point:

We as individuals are who we are based on what we love, not what we know. We will go to heaven or to hell based on what we love, not what we know. Knowing, thinking and seeking truth are important things, but their purpose is to shape, guide and serve our loves; love is ultimately what matters. The Writings make it abundantly and repeatedly clear that it is the same with churches: They are ultimately based on love, not knowledge, on their determination to serve the neighbor, not their external forms of worship. And if churches share that common purpose of serving the neighbor then they are in essence one, with doctrinal variations being of little consequence.

(References: Apocalypse Revealed 533; Arcana Coelestia 407, 768, 1799 [3-4], 2048, 2853 [2-3], 2910, 2982, 3310, 3773, 3963 [2], 4292, 4672, 4723, 5826 [2-3], 6637, 6648, 8152, 9256 [4-5], 9276 [2]; Conjugial Love 116; Heaven and Hell 57; The Word 8; The Doctrine of the New Jerusalem Regarding the Sacred Scripture 99, 104)

3773. 'And they would put the stone back in its place over the mouth of the well' means that it was closed up for the time being. This is clear from what has been stated about the stone over the mouth of the well, in 3769, 3771. With regard to these considerations, namely that the Word was uncovered for the Churches and after that closed up, the position is that in the beginning, when any Church is established, the Word is in that initial period closed up to them but later on, through the Lord's provision, is opened up. And from there people learn that all doctrine is based on these two commandments, that the Lord is to be loved above everything else, and the neighbour as themselves. When these two commandments are the end in view the Word is in that case opened up, for all the Law and all the Prophets, that is, the whole of the Word, hangs on them, as does everything from them, and so everything has reference to them. And being in that case governed by the primary teachings concerning truth and good people receive light in each particular thing they see in the Word. For the Lord is present with them at that time by means of angels and is teaching them even though they are not directly aware of it, and is also guiding them into the life of truth and good.

[2] This may also be seen from the consideration that in their infancy all Churches have been such, and have from love worshipped the Lord, and have from the heart loved the neighbour. But in course of time Churches have moved away from these two commandments, and have turned away from good flowing from love and charity towards those things called matters of faith, and so have turned away from life towards doctrine. And to the extent this happens the Word is closed up. These are the factors meant in the internal sense by the words, 'Behold, a well in the field, and behold, three droves of a flock there, lying nearby it; for out of that well they watered the droves; and there was a large stone over the mouth of the well. And all the droves would be gathered there; and they would roll the stone from over the mouth of the well and water the flock; and they would put the stone back in its place over the mouth of the well'.

6125. 'In exchange for horses' means factual knowledge supplied from the understanding. This is clear from the meaning of 'horses' as ideas forming the understanding, dealt with in 2760-2762, 3217, 5321; and since they are spoken of in connection with Egypt, which means factual knowledge, 'horses' here are factual knowledge supplied from the understanding. But what factual knowledge supplied from the understanding is must be stated. There is an understanding part and there is a will part in the human mind, and these are situated not only in his internal man but also in his external. The human understanding is developing and growing from early childhood through to manhood, and it consists in a discernment of things gained from experience and formal knowledge, also a discernment of causes from effects as well as of consequences from a chain of causes. Thus the understanding part consists in a comprehension and perception of such things as are part of everyday life, public and private. An inflowing of light from heaven brings it into existence, and for that reason everyone's understanding is capable of being made more perfect. Understanding is given to everyone in accordance with his effort to make use of what he knows, in accordance with the life he leads, and in accordance with his individual character; no one lacks it provided he is of sound mind. A person is given it to the end that he may have freedom of choice, that is, have the freedom to choose good or evil. Unless he possesses an understanding like the one just described, he has no power of his own to make that choice; thus nothing could possibly be made his own.

[2] In addition to this it should be recognized that the understanding part of a person's mind is that which receives what is spiritual, so that it is the recipient of spiritual truth and good. For no good at all, that is, no charity, nor any truth at all, that is, any faith, can be instilled into anyone if he does not have that understanding part; but they are instilled in the measure that he does have it. This also explains why a person is not regenerated by the Lord until adult life when he does possess an understanding. Till then the good of love and the truth of faith fall like seed into utterly infertile soil. But once a person has been regenerated his understanding serves the function of enabling him to see and perceive what good is and from this what truth is. For the understanding converts things belonging to the superior light of heaven into those belonging to the inferior light of the natural world, as a consequence of which the former are then seen within the latter in the same way as a person's inner affections are seen in his face when it lacks all pretence. And because the understanding serves that function, many places in the Word where the spiritual side of the Church is referred to refer also to its power of understanding, a matter which will in the Lord's Divine mercy be dealt with elsewhere.

[3] From all this one may now see what is meant by factual knowledge supplied from the understanding, namely known facts which lend support to the things a person grasps and perceives with his understanding, whether those things are bad or good. Such facts are what are meant in the Word by 'horses from Egypt', as in Isaiah,

Woe to those who go down into Egypt for help, and rely on horses and trust in chariots because they are many, and on horsemen because they are extremely strong, but do not look to the Holy One of Israel and do not seek Jehovah. For Egypt is man (homo), not God; and his horses are flesh, not spirit. Isaiah 31:1, 3.

'Horses from Egypt' stands for factual knowledge supplied from a perverted understanding.

[4] In Ezekiel,

He rebelled against him by sending his ambassadors to Egypt, that ha might give him horses and many people. Will he prosper? Will he who does this be rescued? Ezekiel 17:15.

'Horses from Egypt' again stands for factual knowledge supplied from a perverted understanding, which knowledge is resorted to in matters of faith, though there is no belief in the Word, that is, in the Lord, apart from what that knowledge provides. Thus no belief ever comes to exist, for within a perverted understanding a negative attitude reigns.

[5] The destruction which such factual knowledge underwent is represented by the drowning of Pharaoh's horses and chariots in the Sea Suph; and since that knowledge is meant by 'horses' and false matters of doctrine by 'chariots', his horses and chariots are mentioned so many times in the description of that event, see Exodus 14:17-18, 27, 26, 28. And the Song of Moses and Miriam consequently contains these words,

Pharaoh's horse went, also his chariot, also his horsemen, into the sea; but Jehovah made the waters of the sea come back over them. Sing to Jehovah, for He has highly exalted Himself; He has thrown the horse and its rider into the sea. Exodus 15:19, 21.

[6] Similar factual knowledge is also meant by the things required before-hand for a king over Israel, in Moses,

If they desire a king, from among their brothers shall a king be set over them. Only let him not multiply horses for himself nor lead the people back into Egypt in order to multiply horses. Deuteronomy 17:15-16.

'A king' represented the Lord as regards Divine Truth, 1672, 1728, 2015, 2069, 3009, 3670, 4575, 4581, 4789, 4966, 5044, 5068, thus as regards intelligence since this comes, when it is genuine, from Divine Truth. The need for intelligence to be acquired through the Word, which is Divine Truth, and not through factual knowledge taken from one's own understanding is meant by the injunction that the king should not multiply horses or lead the people back into Egypt in order to multiply horses.