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)

2910. 'And Abraham came to mourn for Sarah and to weep for her' means a state in which the Lord grieved, that is to say, because it was night as regards the truths of faith within the Church. This is clear from the representation of 'Abraham' as the Lord, dealt with in 1893, 1965, 1989, 2011, 2172, 2501, 2833, 2836. That 'mourning' and 'weeping' mean a state involving grief is clear without explanation. 'Mourning' has regard to grief on account of its being night as regards goods within the Church, and 'weeping' as regards truths. These two verses have dealt with the end of the Church, which arrives when charity does not exist any longer. The end of the Church is the subject many times in the Word, especially in the Prophets and in John, in the Book of Revelation. The Lord too in the Gospels describes that end extensively, calling it the close of the age, and also night.

[2] The situation with all Churches is that initially every Church regards charity as being fundamental. At that time every individual person loves every other as his brother and is moved by good - not on his own account but on account of that person, of the general good of all, of the Lord's kingdom, and above all of the Lord Himself. But with the passage of time charity starts to grow cold and to cease to exist. After that, hatred of one person against another enters in, which - though not apparent outwardly because people in organized society are subject to laws and to external restraints which keep them in check - is nevertheless being fostered inwardly. The external restraints keeping them in check stem from self-love and love of the world, being the love of position and importance, the love of wealth and also of the power that wealth brings, and so the love of reputation. Beneath these loves there lurks hatred of the neighbour, such as leads people to desire dominion over all and to possess everything that belongs to anyone else. And when these desires are opposed, such persons harbour in their mind contempt for that neighbour, breathe revenge, and take delight in his ruin, and indeed perform acts of cruelty on him insofar as they dare. It is into ways such as these that the charity of the Church ultimately goes when it reaches its end. At that time it is said of the Church that faith does not exist any longer, for when there is no charity there is no faith, as has been shown many times.

[3] There have been many Churches, which are known of from the Word, that have come to an end in this fashion. The Most Ancient Church breathed its last in such circumstances around the time of the Flood. So in a similar way did the Ancient Church which existed after the Flood, as also did the second Ancient Church called the Hebrew Church; and later on the Jewish Church. This never was a Church that had charity at the outset, but was merely the representative of a Church whose role was to preserve by means of representatives a communication with heaven until the Lord came into the world. After that a new Church was established by the Lord, which was called the gentile Church and was an internal Church since interior truths from the Lord had then been revealed. But even this Church has now reached its end, for now not only is charity non-existent but also hatred is present instead of charity. Although that hatred is not apparent outwardly it is nevertheless there inwardly and breaks out when at all possible, that is, as often as external restraints do not keep people in check.

[4] In addition to these Churches there have been many others which have not been described so specifically [in the Word] but which deteriorated in a similar way and destroyed themselves. There are many reasons why they have so deteriorated and destroyed themselves. One reason is that parents pile up evils, and from practicing these frequently until at length they become habitual, introduce them into their own nature and disposition, and in so doing hand them down by heredity to their offspring. For what parents acquire through frequent practice in their actual living takes root within their natural disposition and is transmitted by heredity to their descendants. And unless these are reformed or regenerated, that which is transmitted is perpetuated in succeeding generations, increasing all the time as it is passed down. Consequently the will becomes even more bent on evils and falsities. But when the Church reaches its close and perishes the Lord always raises up a new Church somewhere else. Yet rarely, if ever, has He done so from members of the previous Church, but from gentiles who dwelt in ignorance. Those gentiles are the subject in what follows next.

3318. 'And he was weary' means a state of conflict. This becomes clear from the meaning of 'weary' or weariness as the state following conflict. Here however, because the subject is a state of conflict in which good and truth within the natural man are joined together, the state of conflict itself is meant. As regards 'weary' here meaning a state of conflict, this is not apparent except from the train of thought in the internal sense, and in particular from the fact that without conflicts, or what amounts to the same, without temptations, good is unable to be joined to truth in the natural man.

[2] So that the nature of this state may be known - though only as man experiences it - let a brief statement be made regarding it. Man is nothing other than an organ or vessel which receives life from the Lord, for man does not live of himself, 290, 1954, 2021, 2536, 2706, 2886-2889, 3001. The life flowing in with man from the Lord comes from His Divine Love. This Love, that is, the life from it, flows in and applies itself to the vessels that are in man's rational and that are in his natural. On account of the hereditary evil into which man is born, and on account of the evil of his own doing which man acquires to himself, these vessels with him are set the wrong way round for receiving that life. But insofar as it is possible for this inflowing life to do so, it resets those vessels to receive it. These vessels within the rational man and within his natural are such as are called truths. In themselves they are nothing else than perceptions of the variations in form possessed by those vessels and of the changes of state which in different ways give rise to those variations, which are produced in the most delicate of organic substances, and in ways that defy description, 2487. Good itself, which possesses life from the Lord, that is, which is life, is that which flows in and resets them.

[3] When therefore those vessels, varying in the forms they take, are set and turned, as has been stated, the wrong way round for inflowing life, they clearly have to be re-positioned to receive that life, that is, to be controlled by it. This cannot possibly be effected as long as the person remains in that condition into which he was born or which he has brought upon himself. Indeed at that time they are unsubmissive because they resolutely withstand and harden themselves against the heavenly order governing the way that life acts. Indeed the good which moves them, and to which they are subservient, is that which stems from self-love and love of the world. From the dull warmth it contains that good makes these vessels what they are. Consequently before they can be made submissive and capable of receiving any of the life that belongs to the Lord's love, they have to be softened. The only ways that such softening can be achieved is by temptations, for temptations take away the things that constitute self-love and contempt for others in comparison with oneself, consequently that constitute self-glory, and also hatred and revenge on account of that. When therefore they have to some extent been subdued and mellowed by means of temptations those vessels start to become yielding and compliant to the life which belongs to the Lord's love and which is constantly flowing in with man.

[4] From this point onwards good, first of all in the rational man and then in the natural, starts to be joined to the truths there, for as has been stated, truths are nothing else than perceptions of the variations in form which are determined by the states that are changing all the time - those perceptions being a product of the life that is flowing in. This is the reason why a person is regenerated, that is, is made new, by means of temptations, or what amounts to the same, by means of spiritual conflicts, and after that receives an inward disposition different from before, that is to say, becomes gentle, humble, single-minded, and contrite at heart. From these considerations one may now see the use served by temptations, which is that good from the Lord may not only flow in but also render the vessels subservient and so join itself to them. For truths are the recipient vessels of good, see 1496, 1832, 1900, 2063, 2261, 2269. Here therefore, since the subject is the joining together of good and truth in the natural man, and since the first stage of that conjunction comes about through the conflicts brought about by temptations, 'he was weary' clearly means a state of conflict.

[5] As for the Lord however, who is the subject here in the highest sense, He so imposed Divine order on everything within Himself by means of the very severe conflicts that went with temptations that nothing remained of the human He had derived from the mother, 1444, 1573, 2159, 2574, 2649, 3036, so that He was not made new as any other human being but was made altogether Divine. For man, who is made new through regeneration, nevertheless retains within himself the inclination towards evil; indeed he retains the evil itself but is withheld from it by the influx of the life that is the life of the Lord's love, and by an extremely powerful force. But the Lord cast out completely everything evil that was His by heredity from the mother and made Himself Divine, doing so even as to the vessels, that is, as to the truths. This is what in the Word is called Glorification.