9606. 'On the edge of the one curtain at the end in the joining-place' means of one sphere to the other, that is to say, the joining together of the two. This is clear from the meaning of 'the edge of the curtain at the end in the joining-place' as the place where one ends and the other begins, thus the boundary where the two come together. The reason why a sphere is what is meant is that in heaven spheres come together; for there are spheres that go out from each angelic community in heaven, and from each angel in a community. These spheres from each one emanate from the life of their affections for truth and good; and they spread a long way out. This explains why the character of spirits and angels is recognizable when they are a long way off. Those spheres are what bind angels and angelic communities together and they are also what split them apart; for similar spheres, that is, similar affections for truth and good, come together, and dissimilar ones move apart. But see what has been shown already about those spheres in 1048, 1053, 1316, 1504-1520, 1695, 2401, 2489, 4464, 5179, 6206 (end), 6598-6613, 7454, 8630, 8794, 8797, 9490-9492, 9498, 9534. Whether you say the angels and angelic communities, or the truth and good, from which the spheres emanate it amounts to the same thing, for the spheres are emanations from affections for truth and good, by virtue of which the angels are angels from the Lord. It should be recognized that to the extent that these spheres originate in the Lord they come together, but to the extent that they originate in the self of an angel they move apart. From this it is evident that the Lord alone brings them together.

9534. 'And you shall make for it a rail of a hand's breadth round about' means the joining there to truth from the Divine. This is clear from the meaning of 'a rail', since this lay outside the rim, as the outermost part of the border, and so the joining to truth from the Divine. None can know that this is what 'a rail' means unless they know about the sphere of good from the Lord which surrounds and thereby protects heaven, and about the extension of and border to it. Regarding the sphere of Divine Good which surrounds heaven and all the communities in heaven and thereby protects them from the intrusion of evils from hell, see above in 9490, 9492, 9498.

[2] This Divine sphere extends even into the hells and also guards them. So it is that the Lord reigns in the hells also, yet with this difference, that the Divine sphere which surrounds and protects heaven is the sphere of Divine Truth joined to Divine Good, whereas that which guards hell is the sphere of Divine Truth separated from Divine Good. The reason why the latter sphere exists in hell is that all in that place reject Divine Good, and reject the Lord's mercy. Such a sphere reigns in outward form in hell; but still the sphere of Divine Truth joined to Divine Good does so in inward form. By means of it those in hell are guarded, so that none does excessive harm to another.

[3] From all this it is evident that the sphere of Divine Good in outward form comes to an end where heaven does so, and the sphere of Divine Truth separated from Divine Good begins where hell begins, and in the gap between there is a joining together, meant by 'the rail of a hand's breadth round about'.