'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.

(რეკომენდაციები: Arcana Coelestia 1927)

9639. 'Acting in combination with each other' means the consequent joining together of the Lord with those who are in that heaven. This is clear from the meaning of 'acting in combination', when it refers to the power meant by 'the hands', as a joining together effected through truth from good, thus a joining involving those in that heaven. For all in heaven are called 'powers', indeed they are powers by virtue of being recipients of Divine Truth that comes from the Lord. This also explains why God's truths are meant in the Word by 'angels', 8192. Divine Good emanating from the Lord is what joins together all who are in heaven; for that which reigns universally in Divine Truths is Divine Good, and what reigns universally joins people together. This joining together is what the combined action of the hands of a board, of each with the other, means.