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.

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

454. Some spirits think that heaven and heavenly joy consist in a life of ease in which they are waited on by others. But they are told that happiness in no way consists in being inactive and finding happiness in that. This would mean that everybody wished to subordinate other people's happiness to his own, and when everybody wished to do that nobody would have it. Such life would not be an active life but a life of idleness in which they would become listless, even though they may well know that unless one is active there is no happiness in life. Angelic life consists in use, and in good deeds of charity. For angels never feel happier than when they are informing and teaching spirits that stream in from the world, or when they are ministering to men and are preventing the evil spirits with them overstepping the mark, and inspiring men with what is good; also when they are arousing the dead into the life of eternity, and after that introducing such souls into heaven if they are capable of it. The happiness they find in all this is more than can possibly be described. Angels in this way are images of the Lord; they love their neighbour more than themselves; and this is what makes heaven heaven. Consequently angelic happiness consists in use, stems from use, and is proportionate to use, that is, to the good deeds of love and charity. As for those spirits who had adopted the idea that heavenly joy consisted in being idle, and that in idleness they would be experiencing eternal joy, they were allowed - once told all this to make them ashamed of that idea - to perceive what such a life was really like. They perceived that it was an utterly dreary kind of life, and destructive of all joy; and that after a short while they would find it repulsive and nauseating.