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.

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

9658. 'Thus it shall be for them both; at the two corners they shall be' means a like joining together everywhere. This is clear from the meaning of 'both', or the two, as a joining together, dealt with above in 9655. Since things were to be the same at both corners, a like joining together everywhere is meant. For the paired boards at the two corners faced all four quarters - this was how the two legs at the corners were assembled - and to face all four quarters is to look everywhere. And since things were to be alike at both, a like joining together everywhere is meant.