Luke 8:30-33 Devils go into the deep

³⁰ And Jesus asked him, saying, What is thy name? And he said, Legion: because many devils were entered into him.
³¹ And they besought him that he would not command them to go out into the deep.
³² And there was there an herd of many swine feeding on the mountain: and they besought him that he would suffer them to enter into them. And he suffered them.
³³ Then went the devils out of the man, and entered into the swine: and the herd ran violently down a steep place into the lake, and were choked.
-Luke 8:30-33 King James Version (KJV)

Apocalypse Explained, by Emanuel Swedenborg, [1757-9], tr. by John Whitehead [1911], at sacred-texts.com

538

The "abyss" signifies the hells where and from which are falsities, because those hells where the falsities of evil have rule appear like seas, in the depths of which is the infernal [hellish] crew, which is in the falsities of evil. These hells appear like seas because falsities continually flow out from them, and falsities appear like waters; this is why "waters" in the Word also signify falsities. Moreover, from the waters themselves the quality of the falsity there is known, for falsities are of many kinds, as many as there are evils. Falsities that are from grievous evils appear over those hells like dense and black waters, and falsities from the evil of the love of self like ruddy [red coloured] waters, the density and color making evident the kind of falsity. It must be remembered that in the spiritual world [between heaven and hell] truths also appear like waters, but like limpid and pure waters. This is because there are three degrees of man's life, as there are three heavens. Those in whom the third degree is opened are in an atmosphere pure like ether; [the upper regions of air beyond the clouds] those who are in the third or inmost heaven are in such an atmosphere; those in whom only the second degree is opened are in an atmosphere as it were aerial; [the air] those who are in the second or middle heaven are in such an atmosphere: but those in whom the first degree only is opened are in a kind of watery, rare, and pure atmosphere; those who are in the first or ultimate [lowest] heaven are in such an atmosphere. This is because interior perceptions and thoughts, as being more perfect, correspond to a purity of atmosphere like that in which they are, for they pour themselves forth from every angel and still more from every angelic society, and present a corresponding sphere, which sphere is manifested in a purity like that of the perceptions and thoughts of the angels, that is, of their intelligence and wisdom. This sphere appears, as has been said, like an atmosphere, like an ethereal atmosphere in the inmost heaven, like an aerial atmosphere in the middle heaven, and like a rare watery atmosphere in the ultimate heaven. This makes evident that a kind of watery atmosphere corresponds to natural thought and perception, but a rare watery atmosphere corresponds to spiritual-natural thought and perception in which are the angels of the ultimate heaven; but a dense watery atmosphere, approaching either to black or ruddy, corresponds to natural thought in which there is nothing spiritual, and natural thought in which there is nothing spiritual those have who are in the hells where falsities prevail, for all who are there are merely natural and sensual. [or sense based] (That man has three degrees of life, like the three heavens, and that they differ in purity, see in the work on Heaven and Hell, n. 33, 34, 208, 209, 211.) This makes evident why such hells are called in the Word "seas" and "abysses," "seas" because they appear like seas, and "abysses" from their depth. [2] That "seas," "depths," and "abysses" signify the hells where and from which are the falsities of evil, can be seen in the following passages of the Word... In the Gospels: ...The demons that had possession of the man besought Jesus that He would not command them to depart into the abyss, therefore He suffered them to enter into the swine (Luke 8:31, 33; Matt. 8:31, 32). And in the following passages of Revelation: The beast that came up out of the abyss and made war (11:7). The beast that thou sawest was and is not, and is about to come up out of the abyss (17:8). I saw an angel coming down out of heaven, having the key of the abyss, and a great chain upon his hand. And he bound the dragon a thousand years, and cast him into the abyss (20:1-3). In these passages, also, "the abyss" and "the depth of the sea" signify the hell where and from which are the falsities of evil; for the reason that the evil spirits who are there, and who while they lived as men in the world were in the falsities of evil, seem to dwell as it were in the bottom of the seas, and this the more deeply according to the grievousness of the evil from which was their falsity...