'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.

(Referências: Arcana Coelestia 1927)

568. For us human beings, spiritual warmth is the warmth of life, because as already noted it is essentially love. This love is what fire means in the Word. Heavenly fire means love for the Lord and love for our neighbor, and hellish fire means love for oneself and love of the world.