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.

(Reference: 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'.

3750. What kind of idea about heaven those people have who, superior to all others, are thought to be in communication with heaven and to be under its influence has also been shown to me visually. Appearing overhead are those who in the world wished to be worshipped as gods and with whom self-love had been raised up as far as it could possibly go as they rose up in the hierarchy and acquired the supposed liberty that went with such powerful positions. At the same time those people are deceitful, acting under a presence of innocence and of love to the Lord. Their appearance on high overhead is the result of a delusion about height; but in fact they are underfoot in hell.

[2] One of them brought himself down to me, who, I was told by others, had been Pope when in the world. He spoke to me very courteously, first of all about Peter and his keys which he imagined that he had held. But when I asked him about the power of letting into heaven whomever he liked he had so crude an idea about heaven that he represented it as a door through which entrance was gained. He said that he opened the door to the poor for nothing, but that the rich were assessed according to their means, and that what they gave was holy. I asked whether he believed that those he let in remained there. He said that he did not know; if they did not, then they went away. I went on to say that he could not know those persons interiorly - whether they were worthy persons or possibly robbers who should be in hell. He said that this was no concern of his; if they were not worthy they could be sent away. But he was told what was meant by Peter's keys, namely faith rooted in love and charity; and because the Lord alone confers such faith the Lord alone is the one who lets people into heaven. He was also told that Peter does not appear to anyone but is a simple ordinary spirit who has no more power than anyone else. Concerning the Lord this former Pope held no other opinion than that He ought to be worshipped insofar as He confers such power; and that if He did not confer it, he thought - as I perceived - that He ought not to be worshipped any longer. I then went on to talk to him about the internal man, of which he had a foul idea.

[3] I was shown visually the nature of the freedom, fullness, and delight of the respiration he enjoyed when seated on his throne in his consistory and believed that he spoke under the influence of the Holy Spirit. He was taken back into a similar state he had passed through there - for in the next life anyone can be taken back without difficulty into the state of life which he had passed through in the world, because the state of his life remains with him after death - and the nature of his respiration in that state was conveyed to me. It was free and attended with delight, slow, regular, deep, and filling the whole breast. But when he was contradicted there was in the abdomen, into which his respiration extended, something that seemed to be turning over and crawling about. And when he imagined that what he pronounced was Divine he perceived it from his respiration, which was more soundless and so to speak in harmony with it.

[4] I was then shown who the spirits are who direct Popes like this one, namely the horde of sirens overhead who have acquired that disposition and life by which they worm their way into every kind of affection with the intention of ruling over others and subjecting them to themselves, and of destroying for selfish reasons whomever they can, employing holiness and innocence as the means. They fear for themselves and so act cautiously; but given the opportunity they plunge for selfish reasons into merciless acts of cruelty.