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'.

6397. 'Will judge his people, as one of the tribes of Israel' means that it is one of the truths in general which the tribes of Israel represent. This is clear from the meaning of 'judging' as truth exercising its proper function, dealt with below; from the meaning of 'people' as those governed by truth, dealt with in 1259, 1260, 2928, 3295, 3581, 4619, at this point those guided by truth but not as yet by good, since they are Dan, that is, the people of Dan, 6396; and from the representation of 'the tribes of Israel' as all truths and forms of good in general, dealt with in 3858, 3926, 3939, 4060, 6335. Consequently 'will judge his people, as one of the tribes of Israel' means that the truth which 'Dan' represents is one of the general truths that 'the tribes of Israel' represent. The reason why 'judging his people' means truth exercising its proper function is that all truths in general are represented by 'the tribes of Israel', as may become clear from the paragraphs referred to above; and since truths are what act as judges, 'judging his people' means truth exercising its proper function.

[2] In the Word one reads the description that the twenty-four elders will sit on thrones and judge nations and peoples, and that the twelve apostles will similarly sit on thrones and judge the twelve tribes of Israel. A person with no knowledge of the internal sense of the Word will think that precisely that is going to happen. But how those descriptions should be understood becomes clear when one knows from the internal sense what 'the twenty-four elders', 'the twelve apostles', and also 'thrones' mean, namely all truths in their entirety, in accordance with which judgement is effected. The same goes for one's understanding here of 'judging his people as one of the tribes of Israel'. The meaning is not that these or any other elders among them will act as judges, but that the actual truths meant by them, therefore the Lord alone since every truth comes forth from Him, will do so. The reference to the twenty-four elders who will sit on thrones and act as judges occurs in John as follows,

Around the throne were twenty-four thrones, and on the thrones I saw twenty-four elders seated, clad in white garments, who had crowns of gold on their heads. Revelation 4:4; 11:16.

In the same book,

I saw thrones, and they sat on them, and judgement was given to them. Revelation 20:4.

The reference to the twelve apostles occurs in Matthew,

Jesus said, You who have followed Me, in the regeneration, when the Son of Man sits on the throne of His glory, will also sit on twelve thrones, judging the twelve tribes of Israel. Matthew 19:28.

And in Luke,

I bestow on you, just as My father bestowed on Me, a kingdom, that you may eat and drink at My table in My kingdom, and sit on thrones, judging the twelve tribes of Israel. Luke 21:29-30.

Here neither the twenty-four elders nor the twelve apostles are what are really meant but all truths and forms of good in general, as may be recognized from the consideration that nobody, not even any angel, can judge anyone; for no one except the Lord alone can know what a person is or ever will be like interiorly. With regard to the twelve apostles, that they had a similar meaning to the twelve tribes, which was all truths and forms of good in their entirety, see 2129, 2553, 3488, 3858 (end). From all this it is now evident that 'Dan will judge his people, as one of the tribes of Israel' means that the truth represented by 'Dan' is one of the general truths by means of which judgement is effected.