Midst
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.
(References: Apocalypse Revealed 44, 90, 268; Arcana Coelestia 2252, 2940, 10153, 10365, 10557, 10635, 10641)
Arcana Coelestia #3883
3883. THE GRAND MAN AND CORRESPONDENCE - continued IN THIS SECTION THE CORRESPONDENCE WITH THE HEART AND LUNGS
What the Grand Man is, and what correspondence with it is, has been stated already. The Grand Man consists in heaven in its entirety, which in general is a likeness and image of the Lord. Correspondence is a correspondence of the Lord's Divine with the celestial and spiritual things of heaven, and of those celestial and spiritual things of heaven with natural things in the world, primarily those in man. Thus there exists, by means of heaven or the Grand Man, a correspondence of the Lord's Divine with man and every individual part of him, so much so that man comes into being from that correspondence and is all the time coming into being, that is, is kept in being, from it.