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)

5826. 'You know that my wife bore me two sons' means if spiritual good is what the Church possesses, internal good and truth will exist. This is clear from the representation of Israel, who says these things about himself, as spiritual good from the natural, dealt with immediately above in 5825; from the representation of Rachel, to whom the wife who had borne him two sons refers here, as the affection for interior truth, dealt with in 3758, 3782, 3793, 3819; and from the representation of Joseph and Benjamin,' the two sons she had borne, as internal good and truth, 'Joseph' being internal good and 'Benjamin' internal truth.

[2] What is meant by internal good and truth existing if spiritual good is what the Church possesses is this: Spiritual good, which 'Israel' represents, is the good of truth, that is, truth existing in will and action. This truth or good of truth causes a person to be a Church. When truth has been implanted in his will - something he perceives to have happened from the fact that he feels an affection for truth because his intention is to live according to it - internal good and truth are present in him. When that internal good and truth are present in a person he has the Lord's kingdom within him and he is consequently the Church; and together with those who are very similar to him he constitutes the Church at large. From this it may be recognized that for the Church to be the Church spiritual good, which is the good of truth, must exist and not simply truth by itself. At the present day it is by virtue of truth alone that a Church is called the Church, and it is what marks off one Church from another. Let anyone ask himself whether truth is anything unless it has life in view. What are religious teachings without that end in view? What for example are the Ten Commandments if separated from a life led according to them? For if someone knows them and the full extent of their meaning and yet leads a life contrary to them, what use are they? Surely none at all; indeed do they not serve to condemn some people? The same is so with other religious teachings that are derived from the Word. These too, being spiritual laws, are commandments for leading a Christian life; they likewise have no use at all unless they are made a person's guide to life. Let anyone weigh up what resides with himself and discover whether he has anything there which really is anything other than what enters into the life he leads, or whether life which really is his life resides anywhere else in a person than in his will.

[3] This is the reason why the Lord has declared in the Old Testament and confirmed in the New that all the Law and all the Prophets are founded on love to God and love towards the neighbour, thus on life. They are not founded on faith apart from life, nor thus in any way at all on faith alone, nor consequently on confidence; for without charity towards the neighbour such confidence is impossible. If it seems to exist with the wicked at times when their lives are in danger or death is at hand it is a spurious or false confidence; for among such people in the next life not a trace of this confidence can be seen, however ardently they may have appeared when near to death to profess that they possessed it. But faith, no matter whether you call it confidence or else trust, does nothing for the wicked, as the Lord Himself teaches in John,

As many as received Him, to them He gave power to be sons of God, to those believing in His name, who were born, not of blood, ¹ nor of the will of the flesh, nor of the will of man, but of God. John 1:12-13.

[4] Those born of blood' stands for those who do violence to charity, 374, 1005, also those who render truth profane, 4735. 'Those born of the will of the flesh' stands for those governed by evils that spring from self-love and love of the world, 3813. 'Those born of the will of man' stands for those governed by utterly false notions; for 'man' (vir) means truth and in the contrary sense falsity. 'Those born of God' stands for those who have been regenerated by the Lord and are consequently governed by good. The latter are the ones who receive the Lord; they are the ones who believe in His name; and they, not the former, are the ones to whom He gives power to be sons of God. From all this it is quite evident what contribution faith alone makes to salvation.

[5] To take the matter further, if a person is to undergo regeneration and become a Church he must be led by means of truth into good, which happens when truth becomes truth existing in will and action. This truth is good and is called the good of truth. It constantly brings forth new truths, since then for the first time it is fruitful. The truth that is brought forth or made fruitful from it is what is called internal truth; and the good from which it springs is called internal good. For nothing becomes internal until it has been implanted in the will, the will being the inmost part of a person. As long as good and truth remain outside the will and solely in the understanding they are outside the person; for the understanding is outside, the will inside.

Footnotes:

3813. As regards 'flesh', this means in the highest sense the Proprium of the Lord's Divine Human, which is Divine Good, and in the relative sense means the will side of the human proprium when made alive by the Proprium of the Lord's Divine Human, that is, by His Divine Good. This proprium is the one called the heavenly proprium which, in itself the Lord's alone, is appropriated to those who are governed by good and consequently by truth. Such a proprium exists with angels in heaven, and also with men whose interiors, that is, their spirits, are in the Lord's kingdom. But in the contrary sense 'flesh' means the will side of the human proprium, which in itself is nothing but evil, and not having been made alive by the Lord is called dead; and the individual himself is for that reason called dead.

[2] That 'flesh' in the highest sense means the Proprium of the Lord's Divine Human, and so His Divine Good, is clear from the Lord's words in John,

Jesus said, I am the living bread which came down from heaven; if anyone eats of this bread he will live for ever. The bread which I will give is My flesh, which I will give for the life of the world. The Jews disputed with one another, saying, How can this man give his flesh to eat? Jesus therefore said to them, Truly, truly, I say to you, Unless you eat the flesh of the Son of Man and drink His blood, you will have no life in yourselves. He who eats My flesh and drinks My blood has eternal life, and I will raise him up on the last day; for My flesh is truly food, and My blood is truly drink. He who eats My flesh and drinks My blood abides in Me, and I in him. This is the bread which came down from heaven. John 6:51-58.

Here it is quite evident that 'flesh' means the Proprium of the Lord's Divine Human, and so the Divine Good - His flesh in the Holy Supper being called 'the body'. His body or flesh in the Holy Supper is the Divine Good, and His blood the Divine Truth, see 1798, 2165, 2177, 3464, 3735. And since bread and wine have the same meaning as flesh and blood - that is to say, 'bread' is the Lord's Divine Good, and 'wine' His Divine Truth - bread and wine were commanded in place of flesh and blood. This is why the Lord says, 'I am the living bread; the bread which I will give is My flesh; he who eats My flesh and drinks My blood abides in Me and I in him; this is the bread which came down from heaven'. 'Eating' means being communicated, being joined to, and being made one's own, see 2187, 2343, 3168, 3513 (end), 3596.

[3] The same was represented in the Jewish Church by the law that the flesh of sacrifices was to be eaten by Aaron and his sons, by those persons who brought the sacrifice, and by others who were clean; and that this flesh was holy, see Exodus 12:7-9; 29:30-34; Leviticus 7:15-21; 8:31; Deuteronomy 12:27; 16:4. That being so, if any unclean person ate some of that flesh he was to be cut off from his people, Leviticus 7:21. The fact that these sacrifices were called 'bread', see 2165, and that that sacrificial flesh was called 'holy flesh', Jeremiah 11:15; Haggai 2:12. And in Ezekiel 40:43 where the new Temple is the subject, it is called 'the flesh of the offering which is on the tables in the Lord's kingdom', by which clearly worship of the Lord in His kingdom is meant.

[4] That 'flesh' in the relative sense means the will side of man's proprium when made alive by the Lord is Divine Good is clear also from the following places: In Ezekiel,

I will give them one heart, and will put a new spirit in your midst; and I will remove the heart of stone out of their flesh and will give them a heart of flesh. Ezekiel 11:19; 36:26.

'The heart of stone out of their flesh' stands for a will and proprium when not made alive, 'a heart of flesh' for a will and proprium when made alive; for 'the heart' is a representative of good in the will, see 2930, 3313, 3635. In David,

O God, You are my God; in the morning I seek You. My soul thirsts for You, my flesh in a dry land longs for You, and I am weary without water. Psalms 63:1.

In the same author,

My soul longs for the courts of Jehovah; my heart and my flesh shout for joy to the living God. Psalms 84:2.

[5] In Job,

I have come to know my Redeemer; He is alive; and at the last He will rise above the dust; and afterwards these things will be encompassed by my skin, and out of my flesh shall I see God, whom I shall see for myself; and my eyes will behold, and no other. Job 19:25-27.

'Being encompassed by skin' stands for the natural, such as a person possesses after death, dealt with in 3539. 'Out of his flesh seeing God' stands for the proprium when made alive, which is why Job says, 'Whom I shall see for myself; and my eyes will behold, and no other'. Since it was well known in the ancient Churches that 'flesh' meant the proprium, and since the Book of Job is a book of the Ancient Church, 3540 (end), he accordingly followed the custom of the day and drew on meaningful signs to speak of these, as of many other matters. Those therefore who conclude from what Job said that their dead body is going to be reassembled from the four winds and is going to rise again do not know the internal sense of the Word. Those who are conversant with that sense know that they will enter the next life in a body, but in a purer one. In that life people have purer bodies, for they behold one another, talk to one another, and are endowed with each of the senses, which though like those in the physical body are now keener. The body which a person carries around on earth is designed for activities on earth and therefore consists of flesh and bones, whereas the body that a spirit carries around in the next life is designed for activities in that life and does not consist of flesh and bones but of such things as correspond to these, see 3726.

[6] That 'flesh' in the contrary sense means the will side of the human proprium which in itself is nothing but evil is clear from the following places: In Isaiah,

Every man will eat the flesh of his own arm. Isaiah 9:20.

In the same prophet,

I will feed your oppressors with their own flesh, and they will be drunk with their blood as with new wine. Isaiah 49:26.

In Jeremiah,

I will feed them with the flesh of their sons and with the flesh of their daughters, and every man will eat the flesh of his companion. Jeremiah 19:9.

In Zechariah,

Those that are left will eat, every one the flesh of another. Zechariah 11:9.

In Moses,

I will chastise you seven times for your sins, and you will eat the flesh of your sons: and the flesh of your daughters will you eat. Leviticus 26:28-29.

The will side of the human proprium, or man's own natural inclinations, is described in this way because it is nothing but evil and consequent falsity, and so hatred against every form of truth or good, that are meant by 'eating the flesh of their own arm', 'the flesh of sons and daughters', and 'the flesh of another'.

[7] In John,

I saw an angel standing in the sun, who called out with a loud voice, saying to all the birds flying in mid-heaven, Come and gather yourselves to the supper of the great God, so that you may eat the flesh of kings, and the flesh of captains, and the flesh of mighty men, and the flesh of horses and those seated on them, and the flesh of all free men and slaves, both small and great. Revelation 19:17-18; Ezekiel 39:17-20.

Anyone may see that the flesh of kings, captains, mighty men, horses and those seated on them, free men and slaves, is not meant by such expressions. 'Flesh' accordingly has another meaning which has not been known up to now. The fact that evils resulting from falsities, and evils producing falsities, are meant - which evils originate on the will side of the human proprium - is evident from each expression used here.

[8] Since falsity which springs from the understanding side of man's proprium is meant by 'blood' in the internal sense, and evil which springs from the will side of his proprium by 'flesh', the Lord speaks of the person who is to be regenerated as follows,

As many as received Him, to them He gave power to be sons of God, to those believing in His name, who were born, not of blood, nor of the will of the flesh, nor of the will of man, but of God. John 1:12-13.

For this reason 'flesh' is used to mean in general all mankind, see 574, 1050 (end). For whether you speak of man or of man's proprium it amounts to the same.

[9] That 'flesh' in the highest sense means the Lord's Divine Human is evident from the verses quoted above, as well as from the following in John,

The Word became flesh and dwelt among us, and we beheld His glory, glory as of the Only Begotten from the Father. John 1:14.

It is by virtue of this flesh that all other flesh is made alive, that is, by virtue of the Lord's Divine Human, every human being is made alive, through making His love his own, which is meant by 'eating the flesh of the Son of Man', John 6:51-58, and by eating the bread in the Holy Supper - for the bread is His body or flesh, Matthew 26:26-27.