220. 'His voice going to and fro' means that only a residue of perception was left, so small as to be solitary and inaudible, so to speak. This is also clear from the next verse in which it is said that Jehovah called out to the man. A similar usage occurs in Isaiah,

The voice of one crying in the wilderness; the voice said, Cry! Isaiah 40:3, 6.

'Wilderness' stands for a Church where no faith exists; 'the voice of one crying stands for the declaration of the Lord's coming, in general for every declaration of His coming, as is made to regenerate persons who have this dictate residing in them.

The "midst" of something in the Bible represents the thing that is most central and most important to the spiritual state being described, the motivation that drives everything else. In general this will be something we love or feel, because at the core of things we are what we love; our loves define us.

(Verweise: Apocalypse Revealed 44, 90, 268; Arcana Coelestia 2252, 2940, 10153, 10365, 10557, 10635, 10641)