Selection from Arcana Coelestia ~ Emanuel Swedenborg
Through the church those are saved who are out of the church. No others are in the faith of charity than those within the church, for the faith of charity is truth of doctrine adjoined to good of life. The case is this: The Lord's kingdom on earth consists of all those who are in good, who though scattered over the whole earth, are still one, and as members constitute one body. Such is the Lord's kingdom in the heavens, where the whole heaven represents one man, which is therefore also called the Grand Man, and what is wonderful and hitherto unknown, all parts of the human body correspond to societies in heaven.And therefore it is sometimes said that some societies belong to the province of the head, some to the province of the eye, others to that of the chest, and so on, which correspondence will of the Lord's Divine mercy be spoken of by itself.THE SOCIETIES WHICH CONSTITUTE HEAVEN
There are three heavens: the First is the abode of good spirits, the Second of angelic spirits, and the Third of angels. And one heaven is more interior and pure than another, so that they are most distinct. Each heaven, the first, the second, and the third, is distinguished into innumerable societies; and each society consists of many individuals, who by their harmony and unanimity constitute as it were one person; and all the societies together are as one man. The societies are distinct from one another according to the differences of mutual love, and of faith in the Lord. These differences are so innumerable that not even the most universal genera of them can be computed; and there is not the least of difference that is not disposed in most perfect order, so as to conspire most harmoniously to a common unity, and the common unity to unanimity of individuals, and thereby to the happiness of all from each, and of each from all. Each angel and each society is therefore an image of the universal heaven, and is as it were a little heaven. (n. 684)
The case is the same with the Lord's church on earth, where the church is like the heart and lungs; while those outside the church answer to the parts of the body which are supported and live from the heart and lungs. Hence it is manifest that without a church somewhere on the earth the human race could not subsist, as the body could not without the heart and lungs. From this cause it is that whenever any church is consummated, that is, becomes no church because there is no longer any charity, a new one is of the Lord's providence always raised up; as when the Most Ancient Church called "Man" perished, a new one was created by the Lord, which was called "Noah," and was the Ancient Church that was after the flood; and when this degenerated and became none, the Jewish and Israelitish representative Church was instituted; and when this became altogether extinct, the Lord then came into the world, and set up again a new one; and this for the purpose that there might be conjunction of heaven with the human race through the church.
(from Arcana Coelestia 2853)