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)

3310. 'A man of the field' means the good of life that has its origin in matters of doctrine. This is clear from the meaning of 'the field'. In the Word reference is made in many places to the earth (or the land), the ground, and the field. When used in a good sense 'the earth' means the Lord's kingdom in heaven and on earth, and so the Church, which is the Lord's kingdom on earth. 'The ground' is used in a similar though more limited sense, 566, 662, 1066-1068, 1262, 1413, 1733, 1850, 2117, 2118 (end), 2928; and the same things are also meant by 'the field', though in a more limited sense still, 368, 2971. And since the Church is not the Church by virtue of matters of doctrine except insofar as these have the good of life as the end in view, or what amounts to the same, unless matters of doctrine are joined to the good of life, 'the field' therefore means primarily the good of life. But in order that such good may be that of the Church, matters of doctrine from the Word which have been implanted within that good must be present. In the absence of matters of doctrine the good of life does indeed exist, but it is not as yet that of the Church, and so not as yet truly spiritual, except in the sense that it has the potentiality to become so, like the good of life as this exists with gentiles who do not possess the Word and therefore do not know the Lord.

[2] That 'the field' is the good of life in which the things of faith, that is, spiritual truths existing with the Church, are implanted, becomes quite clear from the Lord's parable about the sower in Matthew,

A sower went out to sow, And as he sowed some fell on the pathway, and the birds came and devoured them. Some fell on rocky ground where they did not have much soil, ¹ and immediately they sprang up, since they had no depth of soil ² , but when the sun rose they were scorched; and since they had no root they withered away. Some fell among thorns, and the thorns came up and choked them. But some fell on good soil ² and yielded fruit, some a hundredfold, some sixty, some thirty. He who has an ear to hear let him hear. Matthew 13:4-9; Mark 4:3-9; Luke 8:5-8.

This describes four types of land or ground within the field, that is, within the Church. The fact that here 'the seed' is the Lord's Word, and so the truth which is called the truth of faith, and that 'the good soil' is the good which is called the good of charity is evident to anyone, for it is the good in man that receives the Word. 'The pathway' is falsity, 'rocky ground' is truth which is not rooted in good, 'thorns' are evils.

[3] With regard to the good of life which has its origin in matters of doctrine being meant by 'a man of the field', the position is that those who are being regenerated first of all do good as matters of doctrine direct them, for they do not of themselves know what good is. They learn to do good from matters of doctrine concerning love and charity; from these they know who the Lord is, who the neighbour is, what love is, and what charity is, and so what good is. Those who have come into this stage are stirred by the affection for truth and are called 'men (vir) of the field'. But after that, once they have been regenerated they do good not from matters of doctrine but from love and charity, for the good itself which they have learned about through matters of doctrine exists with them, and they are in that case called 'men (homo) of the field'. It is like someone who is by nature inclined to commit adultery, steal, and murder but who learns from the Ten Commandments that such practices belong to hell and so refrains from them. In this state he is influenced by the Commandments, for he fears hell and learns from those Commandments and similarly from much else in the Word how he ought to conduct his life. In his case when he does what is good he does it from the Commandments. But when good exists with him he starts to loathe adultery, theft, and murder to which he was previously inclined. In this state he no longer does what is good from the Commandments but from the good which by now resides with him. In the first state the truth he learns directs him to good, but in the second state good is the source of truth taught by him.

[4] The same also applies to spiritual truths which are called doctrinal and are more interior Commandments still. For matters of doctrine are interior truths which the natural man possesses, the first truths there being sensory ones, the second truths being factual, and interior truths matters of doctrine. The latter are based on factual truths inasmuch as a person can have and retain no idea, notion, or concept of them except from factual truths. But the foundations on which factual truths are based are sensory truths, for without sensory truths nobody is able to possess factual ones. Such truths, that is to say, factual and sensory, are meant by 'a man skilled in hunting', but matters of doctrine are meant by 'a man of the field'. Such is the order in which those kinds of truths stand in relation to one another in man. Until a person has become adult therefore, and through sensory and factual truths possesses matters of doctrine, he is incapable of being regenerated, for he cannot be confirmed in the truths contained in matters of doctrine except through ideas based on factual and sensory truths - for nothing is ever present in a person's thought, not even the deepest arcanum of faith there, which does not involve some natural or sensory idea, though generally a person is not aware of the essential nature of such ideas. But in the next life the nature of them is revealed before his understanding, if he so desires, and also a visual representation before his sight, if he wants it; for in the next life such things can be presented before one's eyes in a visual form. This seems unbelievable but it is nevertheless what happens there.

Footnotes:

8. The Word is not understood except through doctrine from the Word.

The doctrine of the Church must be from the Word: 3464, 5402, 5432, 10763, 10764. Doctrine without the Word is not understood: 9025, 9409, 9424, 9430, 10324, 10431, 10584. True doctrine is a lantern to those who read the Word: 10400. True doctrine must be derived from those ¹ who have received enlightenment from the Lord: 2510, 2516, 2519, 9424, 10105. The Word is understood through doctrine formed by one who is enlightened: 10324. Those who have received enlightenment form doctrine for themselves from the Word: 9382, 10659. There is a difference between those who teach and learn from the doctrine of the Church, and those who do this from the literal sense of the Word alone; and what that difference is: 9025. Those who rely on the literal sense of the Word and are without doctrine reach no understanding about divine truths: 9409-9410, 10582. They fall into many errors: 10431. When those who have affection for the truth because it is the truth become adult and can see with their own understanding, they do not simply remain in the doctrinal ideas of their own Church but find out for themselves from the Word whether they are true: 5402, 5432, 6047. Otherwise anyone's idea of the truth would be derived from someone else and from the land of their birth, whether Jew or Greek: 6047. Still, things that have become items of faith from the literal sense of the Word must not be extinguished except after full examination: 9039.

The true doctrine of the Church is the doctrine of love, in the sense of affectionate regard for your fellow man, ² and faith: 2417, 4766, 10763-10764. The doctrine of faith does not make the Church, but a life of faith does, which is love: 809, 1798-1799, 1834, 4468, 4672, 4766, 5826, 6637. Doctrinal ideas are nothing unless life is lived according to them; and everyone can see that they exist for the sake of life, and not for the sake of memory, and then for a degree of thought: 1515, 2049, 2116. In the various national churches today there is a doctrine of faith and not of love, and the doctrine of love has been driven backwards into a branch of learning, called Moral Theology: 2417. The Church would be a united whole if people were recognized as being people of the Church by the life they lead and the love they show: 1285, 1316, 2982, 3267, 3445, 3451-3452. How much a doctrine of love is worth compared with a doctrine of faith divorced from love: 4844. Those who know nothing of love are in ignorance of heavenly things: 2435. Those who have only a doctrine of faith and not of love slide into lost ways, on which subject see 2383, 2417, 3146, 3325, 3412-3413, 3416, 3773, 4672, 4730, 4783, 4925, 5351, 7623-7627, 7752-7762, 7790, 8094, 8313, 8530, 8765, 9186, 9224, 10555. Those who exist only in the doctrine of faith, and not in the life of faith, which is love, were in other times called the Uncircumcised, or Philistines: 3412-3413, 3463, 8093, 8313, 9340. Among the ancients there was a doctrine of love towards the Lord, and love in the sense of affectionate regard towards your neighbour, and the doctrine of faith was subordinate to this: 2417, 3419, 4844, 4955.

Doctrine formed by one who is enlightened can later be substantiated by rational proofs and proofs founded on sound knowledge, and in this way it can be more fully understood, and corroborated: 2553, 2719, 2720, 3052, 3310, 6047. More on this topic may be seen in The New Jerusalem and Its [Heavenly] Doctrine 51. Those who live in faith divorced from love would wish the doctrinal ideas of the Church to be believed simply, without any rational consideration: 3394.

A man who is wise does not just uphold a dogma but sees whether it is true before he upholds it, and this does happen among those who are in a state of enlightenment: 1017, 4741, 7012, 7680, 7950. This enlightenment is natural, not spiritual, and achievable even among the wicked: 8780. Everything, even falsehoods, can be upheld, even to the extent that they appear to be truths: 2482, 2490, 5033, 6865, 8521.

Footnotes: