Arcana Coelestia # 2713
2713. That 'a wilderness' means that which is obscure in comparison is clear from the meaning of 'a wilderness' as that which is obscure, when it has reference to the spiritual man in comparison with the celestial man, dealt with above in 2708.
Isaiah 50:2-3
2
Why, when I came, was there no man? when I called, was there none to answer? Is my hand shortened at all, that it can't redeem? or have I no power to deliver? Behold, at my rebuke I dry up the sea, I make the rivers a wilderness: their fish stink, because there is no water, and die for thirst.
3
I clothe the heavens with blackness, and I make sackcloth their covering."