'Wilderness' signifies something with little life in it, as described in the internal sense in Luke 1:80 'Wilderness' signifies somewhere there is no good because there is no truth. 'Wilderness,' as in Jeremiah 23:10, signifies the Word when it is adulterated.

(Izinkomba: Arcana Coelestia 1927)

422. And he opened the bottomless pit, and smoke arose out of the pit like the smoke of a great furnace. (9:2) This symbolizes falsities accompanying the lusts of the natural self springing from those people's evil loves.

The bottomless pit symbolizes the hell described just above in no. 421. The smoke from it symbolizes falsities arising from lusts, and because the smoke is said to be like that of a great furnace, it means falsities accompanying lusts springing from evil loves, inasmuch as fire symbolizes love (no. 468), and the fire of hell, evil love (no. 494). A great furnace has the same symbolism, since it smokes owing to fire.

Spirits of hell are not caught up in any material fire, but in a spiritual fire, which is the fire of their love. Consequently they do not feel any other fire. On this subject, see the book Heaven and Hell, nos. 134 566-575.

When any love is aroused in the spiritual world, it appears at a distance like fire - in the hells like a brightly burning fire, and outside the hells like the smoke of a conflagration or the smoke of a furnace.

Falsities accompanying lusts springing from evil loves are described also elsewhere in the Word by smoke from a fire or from a furnace or oven, as in the following places:

(Abraham) looked toward Sodom and Gomorrah..., and behold, the smoke of the land went up like the smoke of a furnace. (Genesis 19:28)

...the sun went down and it was dark, and behold, there appeared a smoking oven and a burning torch that passed between the pieces. (Genesis 15:17)

...they sin more and more... Therefore they shall be... like smoke from a flue. (Hosea 13:2-3)

...the wicked shall perish... In smoke they shall be consumed. (Psalms 37:20)

I will show wonders in heaven and on the earth: ...fire and pillars of smoke. (Joel 2:30)

(They) will cast (the evil) into the furnace of fire. There will be wailing and gnashing of teeth. (Matthew 13:41-42, 49-50)

And elsewhere.

566. WHAT HELL FIRE IS AND WHAT THE GNASHING OF TEETH IS.

What eternal fire is, and what the gnashing of teeth is, which are mentioned in the Word in reference to those who are in hell, scarcely any one as yet has known, because the contents of the Word have been thought about only in a material way, and nothing has been known about its spiritual sense. So fire has been understood by some to mean material fire, by others to mean torment in general, by others remorse of conscience, and others have held that it is mentioned merely to excite terror in the wicked. Likewise some have supposed the gnashing of teeth to mean actual gnashing, and some only a horror, such as is excited when such a collision of teeth is heard. But any one who is acquainted with the spiritual meaning of the Word may know what eternal fire is, and what the gnashing of teeth is; for every expression and every meaning of the expressions in the Word contains a spiritual meaning, since the Word in its bosom is spiritual; and what is spiritual can be set before man only in natural forms of expression, because man is in the natural world and thinks from the things of that world. Therefore it shall now be told what is meant by "eternal fire" and "the gnashing of teeth" into which the spirits of evil men enter after death, or which their spirits, then in the spiritual world, endure.