'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.

(Reference: Arcana Coelestia 1927)

826. 19:14 And the hosts in heaven followed Him on white horses, clothed in fine linen, white and clean. This symbolizes angels in the New Christian Heaven, who, being conjoined with the Lord, have a deeper understanding of the Word and so possess truths that are pure and genuine.

The hosts in heaven mean angels who possess Divine truths and goods (no. 447). Heaven here means the New Christian Heaven, referred to in nos. 612[1-4], 613, 626, 659, 661 above. This is the heaven meant because it is the new heaven foretold in the book of Revelation. To follow the Lord means, symbolically, to be conjoined with Him (no. 621). The white horses on which John saw them symbolize a deeper understanding of the Word, as in no. 820 above. The fine linen, white and clean, symbolizes truth that is pure and genuine obtained through the Word from the Lord (no. 814). We are also told regarding the New Church in verse 8 of this chapter that it would be clothed in fine linen, clean and bright. So we are told the same here as well regarding the New Christian Heaven, through which that church will descend from the Lord.