'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.

(Notae: Arcana Coelestia 1927)

'Heat and light' in the Word signify love and wisdom. Natural heat and light serve as a clothing and support to spiritual and light, whereby they may be conveyed to a person.

(Notae: Heaven and Hell 155, 488)