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.

(Notae: 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)

6637. 'These are the names of the children of Israel' means the essential nature of the Church. This is clear from the meaning of' the name as the essential nature, dealt with in 144, 145, 1754, 1896, 2009, 2628, 2724, 3006, 3421; from the representation of 'the sons of Israel' as spiritual truths, dealt with in 5414, 5879, 5951; and from the representation of 'Israel' as the good of truth, which is spiritual good, dealt with in 3654, 4598, 5803, 5806, 5812, 5817, 5819, 5826, 5833. Since Israel' represents the good of truth or spiritual good and 'his sons' represent spiritual truths in the natural, 'the sons of Israel' also represent the Church, for what makes it the Church is spiritual good and the truths that spring from that good. A person without spiritual good, that is, the good of charity, and without spiritual truths, that is, the truths of faith, does not belong to the Church in spite of having been born within the Church. The whole of the Lord's heavenly kingdom possesses the good of love and faith, and unless the Church possesses good like that it cannot be the Church since it is not joined to heaven; for the Church is the Lord's kingdom on earth.

[2] The term 'Church' is not used because it is the place where the Word is and teachings drawn from it, or because it is where the Lord is known and the sacraments are celebrated. Rather it is the Church because it lives in accordance with the Word or with teachings drawn from the Word, and seeks to make those teachings its rule of life. People who do not live like this do not belong to the Church but are outside it; and those who lead wicked lives, thus lives contrary to that teaching, are further away outside the Church than gentiles who know nothing whatever about the Word, the Lord, or the sacraments. For since those people are acquainted with the forms of good that the Church fosters and with the truths it teaches they annihilate the Church within themselves, something gentiles cannot do because they are unacquainted with those things. It should also be realized that everyone who leads a good life, in charity and faith, is a Church, and is a kingdom of the Lord. He is for that reason also called a temple, and a house of God too. Those who are Churches individually, no matter how remote from one another they may be, constitute one Church collectively. This then is the Church meant by the expression 'the children of Israel' here and in what follows.

4317. In the internal historical sense 'because he touched, in the hollow of Jacob's thigh, the sinew of that which was displaced' means because of their heredity which could not be rooted out through regeneration because they would not allow that to happen. This is clear from the meaning of 'the thigh' as conjugial love, and consequently all celestial and spiritual love, dealt with in 4280, and 'the hollow of the thigh' as the place where conjugial love, and also all celestial and spiritual love, is joined to natural good, 4277, 4280. Consequently 'touching it', that is, so damaging it that limping results, means destroying the good that flows from those loves. And since it was Jacob in whom this was done, that among his descendants which had come down from him, and so was hereditary, is meant. 'The sinew of that which was displaced' means falsity, see 4303, in this case falsity which stems from hereditary evil. The fact that this heredity could not be rooted out through regeneration because they would not allow that to happen follows from this and from the whole train of thought.

[2] The possession of such a heredity and their inability to be regenerated is quite clear from all that is recorded in the Word about them, and especially from the following in Moses,

Moses summoned all Israel and said to them, You yourselves saw all that Jehovah did before your eyes in the land of Egypt to Pharaoh and all his servants, and to all his land; and Jehovah has not given you a heart to know, and eyes to see, and ears to hear, even to this day. Deuteronomy 29:2, 4.

In the same author,

I know the people's imagination, which they are performing today, before I bring them into the land which I have sworn [to give them]. Deuteronomy 31:21.

And further on,

I will hide My face from them; I will see what their end will be, for they are a perverse generation, sons with no truth in them. I would scatter them far, I would make the memory of them cease from mankind, except that I feared the wrath of the enemy. For they are a nation from whose counsel is perishing and in whom there is no intelligence. For from the vine of Sodom comes their vine, and from the fields of Gomorrah their grapes; they have grapes of hemlock, clusters that are bitter. The poison of dragons is their wine, and the cruel head of asps. Is not this stored up with Me, sealed up in My treasuries? Deuteronomy 32:20, 26-34.

The same things are said in many other places, in particular in Jeremiah.

[3] Further evidence that their heredity is meant by the touching of Jacob's thigh and his consequently having a limp may be seen in Hosea,

The controversy of Jehovah with Judah: He will make a visitation on Jacob over his ways, and will render to him according to his deeds. In the womb he supplanted his brother; in his grief he contended with God, and contended against the angel and prevailed; he wept and appealed to him. Hosea 12:2-4.

Here 'contending with God' means, in the internal historical sense, their insistence that a representative of the Church should exist with them, 4290, 4293. From this it is evident that the kind of heredity they possessed had been derived from Jacob himself, as may be shown from further places still but must be passed over for the time being.

[4] As regards heredity specifically, the belief at the present day in the Church is that all hereditary evil is derived from the first parent and that all are therefore condemned in respect of that evil. But this is untrue. The origin of hereditary evil in everyone lies with his parents and parents' parents, that is, with successive generations of ancestors. Every evil which each of these has acquired to himself by his own actions in life, inasmuch as it becomes so to speak part of his character through regular practice or habit, is passed on to his children and becomes hereditary in them; and that evil accompanies what has been implanted in parents from grandparents and ancestors. Hereditary evil coming from the father is more internal, and hereditary evil from the mother more external. That coming from the father cannot be rooted out easily whereas that from the mother can. When a person is being regenerated the deeply-implanted hereditary evil that is received from immediate forbears is rooted out; but with those who are not being regenerated, or who are unable to be, it remains. This then is hereditary evil; see also 313, 494, 2122, 2910, 3518, 3701. This matter is also plain to anyone who reflects, as well as from the fact that every family has some evil or good characteristic by which it is distinguished from other families; and that characteristic, as is well known, is inherited from parents and ancestors. The same applies to the Jewish nation which is still in existence. It is clearly different from all other nations and may be recognized not only from its particular disposition but also from its customs, speech, and facial characteristics.

[5] But few people know what hereditary evil is. It is believed to consist in the doing of evil, when in fact it consists in the willing and therefore thinking of it. It is within the will itself and therefore within thought that hereditary evil dwells. It is the actual inclination to evil which is within them and which attaches itself even when the person does what is good. It is recognized through the kind of delight which enters in when evil befalls another. This root lies hidden deep down, for the interior form itself receiving good and truth from heaven, that is, from the Lord by way of heaven, is perverted and so to speak twisted out of shape, with the result that when good and truth flow in from the Lord these are either cast back or perverted or smothered. This is why no perception of what is good and true exists at the present day, but instead, in the case of the regenerate, conscience which acknowledges as good and true that which has been learned from parents and teachers. Hereditary evil leads to loving oneself more than others, willing evil on another if he does not promote oneself to honour, and taking delight in acts of revenge. It also leads to loving the world more than heaven and to all evil desires or evil affections, which spring from the same source. Man does not know that such things exist within him, still less that they are the opposite of heavenly affections. In the next life however he is shown plainly how much evil, hereditary in origin, he has drawn to himself through his own actions in life, and also how far he has removed himself from heaven through evil affections from the same source.

[6] The fact that hereditary evil in Jacob's descendants could not be rooted out through regeneration because they would not allow that to happen is also evident from the historical descriptions in the Word - in all their temptations in the desert they gave in, as described in Moses, which they also did subsequently in the land of Canaan as often as they did not see miracles taking place. Those temptations however were external ones, and not internal or spiritual. In spiritual things they were incapable of being tempted because they had no knowledge of internal truths nor any possession of internal goods, as shown already; and nobody is able to be tempted except in what he knows or possesses. Temptations are the actual means by which regeneration is accomplished. This is what is meant by them not allowing regeneration to happen. Concerning their state and fate in the next life, see 939-941, 3481.