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.

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

479. 'Calling the name' or 'calling by name' means in the Word knowing a person's character, as shown already. Here it means knowing the character of the Most Ancient Church, which was as follows: Man was taken from the ground, that is, was regenerated by the Lord, for Adam is the ground; afterwards when he became celestial, he was above others Man by virtue of faith inherent in love to the Lord.