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)

2982. 'In the land of Canaan' means which was a united whole in the Lord's kingdom. This is clear from the representation of 'the land of Canaan' as the Lord's kingdom, dealt with in 1413, 1437, 1585, 1607. With the Lord's Churches the position is that in ancient times many existed simultaneously. These differed from one another, as Churches do today, on matters of doctrine, but they still made one in that they acknowledged love to the Lord and charity towards the neighbour as the chief and most essential thing. And so to them matters of doctrine existed not so much to guide their thought as to direct their lives. And when in every single respect love to the Lord and charity towards the neighbour, that is, the good of life, is the essential thing, then no matter how many Churches there are they all make one, and each is a united whole in the Lord's kingdom. The same is also true of heaven. Although there are countless communities there, and each one is distinct and separate from the rest, they nevertheless all constitute one heaven because every one is moved by love to the Lord and charity towards the neighbour.

[2] But the situation is altogether different in the case of Churches which say that faith is the essential thing of the Church, for they imagine that if they know this and think it, they are saved irrespective of whatever kind of life they lead. When this is the situation many Churches existing simultaneously do not make one Church; they are not even Churches. The good of faith is what makes the Church, that is, the life of love and charity in accordance with matters of faith make it. It is for the sake of life that matters of doctrine exist. This anyone may know, for why does any doctrine exist if not for some end in view? And what else is that end but life, that is, that a person may become as such doctrine teaches? Those Churches do indeed speak of saving faith as being trust, but that trust cannot possibly exist except within the good of life. Without the latter there is no receptivity, and when there is no receptivity there is no trust, except on occasions when the mind or body is sick and the desires that belong to self-love and love of the world are dormant. But with those who are leading an evil life, when this crisis is over or takes a different turn, that spurious trust disappears altogether; for trust can exist even with those who are evil. But if a person wishes to know what kind of trust he has, let him examine his affections and ends in view, and also the kind of life his actions reveal.

3451. 'They said, We saw clearly that Jehovah was with you' means that they knew the Divine to be present within it. This is clear from the meaning of 'seeing clearly' as discerning and so as knowing for certain, and from the meaning of 'Jehovah being with you' as the Divine being present within it. As stated above in 3447, the subject here is the agreement of the literal sense of the Word with the internal sense, consequently the agreement of matters of doctrine concerning faith - meant by Abimelech, Ahuzzath, and Phicol - with that same internal sense, insofar, that is, as those matters of doctrine are drawn from the literal sense of the Word. Accordingly the subject is the joining together of the Lord's kingdom on earth with the Lord's kingdom in heaven, and so with the Lord, by means of the Word. For the Word, as to the highest sense, is the Lord Himself; as to the internal sense, the Lord's kingdom itself in heaven; and as to the literal sense, the Lord's kingdom itself on earth, as has also been stated already.

[2] As regards the Lord's kingdom on earth, that is, His Church, because its matters of doctrine are drawn from the literal sense of the Word it is inevitably varying so far as these are concerned. That is to say, one group declares that this idea is the truth of faith because it is so stated in the Word, while another declares that that idea is the truth because that likewise is stated there, and so on. Consequently because its matters of doctrine are drawn from the literal sense of the Word the Lord's Church differs from one group to the next, and not only from group to group but sometimes from individual to individual within a group. But dissent in matters of doctrine concerning faith does not mean that the Church cannot be one Church, provided all are of one mind in willing what is good and doing it.

[3] Take for example someone who acknowledges as a matter of doctrine that charity is the product of faith but nevertheless leads a life of charity towards the neighbour. Even though the truth does not exist with him so far as doctrine is concerned, yet it does exist with him so far as life is concerned, and consequently he has the Lord's Church or kingdom within him. Or, to take another example, someone who says that good works ought to be done for the sake of reward in heaven, as accords with the literal sense of the Word in Matthew 10:41-42; 25:34-36, and elsewhere, and yet when performing good works he gives no thought at all to merit. He likewise is in the Lord's kingdom because the truth exists in him so far as life is concerned. This being what he is really like so far as life is concerned, he readily allows himself to be told that nobody is able to reach heaven on merit and that the works which a person regards as meritorious are not good. So it is with every other example that could be taken. For the literal sense is such that in many places it seems to contradict itself, the reason being that it contains appearances of truth that are suited to those who are engrossed in external things, and therefore who are also filled with a love of worldly things as well as bodily pleasures.

[4] Here therefore, through 'Abimelech', those people are dealt with who possess matters of doctrine concerning faith and who, as stated above, make faith the essential thing for salvation. Also dealt with is the agreement of their matters of doctrine with the internal sense. These people too, it is clear, are joined to heaven and the Lord by means of the literal sense, yet only those among them with whom good is present, that is, those who, though they make faith the essential thing so far as their doctrine is concerned, nevertheless make charity the essential so far as their life is concerned. For when they have confidence in, or put their trust in the Lord, which they call faith, affection that goes with love to the Lord is present, and therefore so far as life is concerned good is present in them. But see what has been stated and shown already in the following paragraphs:

Not doctrine but charity taught by it makes the Church, 809, 916, 1798, 1799, 1834, 1844.

Matters of doctrine have no value unless people live according to them, 1515.

The Church varies so far as truths are concerned, but is one through charity, 3267.

Parallelism exists between the Lord and man as regards celestial things that are matters of good, but not as regards spiritual things that are matters of truth, 1831, 1832.

Doctrine is invariably the same, that is to say, it is always concerned with love to the Lord and charity towards the neighbour, 3445.

The Church would be one if charity were present with all, even though they differed from one another in forms of worship and in matters of doctrine, 809, 1285, 1316, 1798, 1799, 1834, 1844, 2982.

The Church would be like the Lord's kingdom in heaven if charity were present with all, 2385.

Countless variations of good and truth exist in heaven, but by acting in harmony with one another they nevertheless make one, like the organs and members of the body, 684, 690, 3241.