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.

121. Faith separate from love or charity is like the light of winter, in which all things on earth are torpid, and no harvests, fruits, or flowers, are produced; but faith with love or charity is like the light of spring and summer, in which all things flourish and are produced (n. 2231, 3146, 3412-3413). The wintry light of faith separate from charity is changed into dense darkness when light from heaven flows in; and they who are in that faith then come into blindness and stupidity (n. 3412-3413).

They who separate faith from charity, in doctrine and life, are in darkness, thus in ignorance of truth, and in falsities, for these are darkness (n. 9186). They cast themselves into falsities, and into evils thence (n. 3325, 8094). The errors and falsities into which they cast themselves (n. 4721, 4730, 4776, 4783, 4925, 7779, 8313, 8765, 9224). The Word is shut to them (n. 3773, 4783, 8780). They do not see or attend to all those things which the Lord so often spoke concerning love and charity, and concerning their fruits, or goods in act, concerning which (n. 1017, 3416). Neither do they know what good is, nor thus what celestial love is, nor what charity is (n. 2517, 3603, 4136, 9995).

Faith separate from charity is no faith (n. 654, 724, 1162, 1176, 2049, 2116, 2343, 2349, 2417, 3849, 3868, 6348, 7039, 7342, 9783). Such a faith perishes in the other life (n. 2228, 5820). When faith alone is assumed as a principle, truths are contaminated by the falsity of the principle (n. 2335). Such persons do not suffer themselves to be persuaded, because it is against their principle (n. 2385). Doctrinals concerning faith alone destroy charity (n. 6353, 8094). They who separate faith from charity were represented by Cain, by Ham, by Reuben, by the firstborn of the Egyptians, and by the Philistines (n. 3325, 7097, 7317, 8093).

They who make faith alone saving, excuse a life of evil, and they who are in a life of evil have no faith, because they have no charity (n. 3865, 7766, 7778, 7790, 7950, 8094). They are inwardly in the falsities of their own evil, although they do not know it (n. 7790, 7950). Therefore good cannot be conjoined with them (n. 8981, 8983). In the other life they are against good, and against those who are in good (n. 7097, 7127, 7317, 7502, 7545, 8096, 8313). Those who are simple in heart and yet wise, know what the good of life is, thus what charity is, but not what faith separate is (n. 4741, 4754).

All things of the church have relation to good and truth, consequently to charity and faith (n. 7752-7754). The church is not with man before truths are implanted in his life, and thus become the good of charity (n. 3310). Charity constitutes the church, and not faith separate from charity (n. 809, 916, 1798-1799, 1834, 1844). The internal of the church is charity (n. 1799, 7755). Hence there is no church where there is no charity (n. 4766, 5826). The church would be one if all were regarded from charity, although men might differ as to the doctrinals of faith and the rituals of worship (n. 1285[1-3], 1316, 1798-1799, 1834, 1844, 2385, 2982, 3267, 3451). How much of good would be in the church if charity were regarded in the first place, and faith in the second (n. 6269, 6272). Every church begins from charity, but in process of time turns aside to faith, and at length to faith alone (n. 1834-1835, 2231, 4683, 8094). There is no faith at the last time of the church, because there is no charity (n. 1843). The worship of the Lord consists in a life of charity (n. 8254, 8256) The quality of the worship is according to the quality of the charity (n. 2190). The men of the external church have an internal if they are in charity (n. 1100, 1102, 1151, 1153). The doctrine of the ancient churches was the doctrine of life, which is the doctrine of charity, and not the doctrine of faith separate (n. 2385, 2417, 3419-3420, 4844, 6628, 7259-7262).

The Lord inseminates and implants truth in the good of charity when he regenerates man (n. 2063, 2189, 3310). Otherwise the seed, which is the truth of faith, cannot take root (n. 880). Then goods and truths increase, according to the quality and quantity of the charity received (n. 1016). The light of a regenerate person is not from faith, but from charity by faith (n. 854). The truths of faith, when man is regenerated, enter with the delight of affection, because he loves to do them, and they are reproduced with the same affection, because they cohere (n. 2484, 2487, 3040, 3066, 3074, 3336, 4018, 5893).

They who live in love to the Lord, and in charity towards the neighbor, lose nothing to eternity, because they are conjoined to the Lord; but it is otherwise with those who are in separate faith (n. 7506-7507). Man remains such as is his life of charity, not such as his faith separate (n. 8256). All the states of delight of those who have lived in charity, return in the other life, and are increased immensely (n. 823). Heavenly blessedness flows from the Lord into charity, because into the very life of man; but not into faith without charity (n. 2363). In heaven all are regarded from charity, and none from faith separate (n. 1258, 1394). All are associated in the heavens according to their loves (n. 7085). No one is admitted into heaven by thinking, but by willing good (n. 2401, 3459). Unless doing good is conjoined with willing good and with thinking good, there is no salvation, neither any conjunction of the internal man with the external (n. 3987). The Lord, and faith in Him, are received by no others in the other life, than those who are in charity (n. 2343).

Good is in the perpetual desire and consequent endeavor of conjoining itself with truths, and charity with faith (n. 9206-9207, 9495). The good of charity acknowledges its own truth of faith, and the truth of faith its own good of charity (n. 2429, 3101-3102, 3161, 3179-3180, 4358, 5807, 5835, 9637). Hence there is a conjunction of the truth of faith and the good of charity, concerning which (n. 3834, 4096-4097, 4301, 4345, 4353, 4364, 4368, 5365, 7623-7627, 7752-7762, 8530, 9258, 10555). Their conjunction is like a marriage (n. 1904, 2173, 2508). The law of marriage is that two be one, according to the Word of the Lord (n. 10130, 10168-10169). So also faith and charity (n. 1094, 2173, 2503). Therefore faith which is faith, is, as to its essence, charity (n. 2228, 2839, 3180, 9783). As good is the esse of a thing, and truth the existere thence, so also is charity the esse of the church, and faith the existere thence (n. 3409, 3180, 4574, 5002, 9145). The truth of faith lives from the good of charity, thus a life according to the truths of faith is charity (n. 1589, 1947, 2571, 4070, 4096-4097, 4736, 4757, 4884, 5147, 5928, 9154, 9667, 9841, 10729). Faith cannot be given but in charity, and if not in charity, there is not good in faith (n. 2261, 4368). Faith does not live with man when he only knows and thinks the things of faith, but when he wills them, and from will does them (n. 9224).

There is no salvation by faith, but by a life according to the truths of faith, which life is charity (n. 379, 389, 2228, 4663, 4721). They are saved who think from the doctrine of the church that faith alone saves, if they do what is just for the sake of justice, and good for the sake of good, for thus they are still in charity (n. 2442, 3242, 3459, 3463, 7506-7507). If a mere cogitative faith could save, all would be saved (n. 2361, 10659). Charity constitutes heaven with man, and not faith without it (n. 3513, 3584, 3815, 9832, 10714-10715, 10721, 10724). In heaven all are regarded from charity, and not from faith (n. 1258, 1394, 2361, 4802). The conjunction of the Lord with man is not by faith, but by a life according to the truths of faith (n. 9380, 10143, 10153, 10310, 10578, 10645, 10648). The Lord is the tree of life, the goods of charity the fruits, and faith the leaves (n. 3427, 9337). Faith is the "lesser luminary," and good the "larger luminary" (n. 30-38).

The angels of the Lord's celestial kingdom do not know what faith is, so that they do not even name it, but the angels of the Lord's spiritual kingdom speak of faith, because they reason concerning truths (n. 202-203, 337, 2715, 3246, 4448, 9166, 10786). The angels of the Lord's celestial kingdom say only yea, yea or nay, nay, but the angels of the Lord's spiritual kingdom reason whether it be so or not so, when there is discourse concerning spiritual truths, which are of faith (n. 2715, 3246, 4448, 9166, 10786), where the Lord's words are explained:

Let your discourse be yea, yea, nay, nay; what is beyond these is from evil (Matt. 5:37).

The reason why the celestial angels are such, is, because they admit the truths of faith immediately into their lives, and do not deposit them first in the memory, as the spiritual angels do; and hence the celestial angels are in the perception of all things of faith (n. 202, 585, 597, 607, 784 1 121, 1387, 1398, 1442, 1919, 5113, 5897, 6367, 7680, 7877, 8521, 8780, 9936, 9995, 10124).

Trust or confidence, which in an eminent sense is called saving faith, is given with those only who are in good as to life, consequently with those who are in charity (n. 2982, 4352, 4683, 4689, 7762, 8240, 9239-9245). Few know what that confidence is (n. 3868, 4352).

What difference there is between believing those things which are from God, and believing in God (n. 9239, 9243). It is one thing to know, another to acknowledge, and another to have faith (n. 896, 4319, 5664). There are scientifics of faith, rationals of faith and spirituals of faith (n. 2504, 8078). The first thing is the acknowledgment of the Lord (n. 10083). All that flows in with man from the Lord is good (n. 1614, 2016, 2751, 2882-2883, 2891-2892,2904, 6193, 7643, 9128).

There is a persuasive faith, which nevertheless is not faith (n. 2343, 2682, 2689, 3427, 3865, 8148).

It appears from various reasonings as though faith were prior to charity, but this is a fallacy (n. 3324). It may be known from the light of reason, that good, consequently charity, is in the first place, and truth, consequently faith, in the second (n. 3324-6273). Good, or charity, is actually in the first place, or is the first of the church, and truth, or faith, is in the second place, or is the second of the church, although it appears otherwise (n. 3324-3325, 3330, 3336, 3494, 3539, 3548, 3556, 3570, 3576, 3603, 3701, 3995, 4337, 4601, 4925-4926, 4928, 4930, 5351, 6256, 6269, 6272-6273, 8042, 8080, 10110). The ancients disputed concerning the first or primogeniture of the church, whether it be faith or whether it be charity (n. 367[1-2], 2435, 3324).