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)

246. 'Beast' and 'wild animal of the field' mean affections. This becomes clear from what has been stated already in 45, 46, about 'beast' and 'wild animal', to which let the following quotation from David be added,

You shake down a shower of blessings, O God; Your heritage which is labouring, You strengthen; Your wild animals will dwell in it. Psalms 68:9-10.

Here also 'wild animal' stands for the affection for good, since it is going 'to dwell in God's heritage'. The reason 'beast' and 'wild animal of the field' are mentioned here, as also in Genesis 2:19, 20, but 'beast' and 'wild animal of the earth' in Genesis 1:24-25, is that the subject is the Church, that is, man when regenerate, whereas in Chapter 1 the subject is the time when the Church does not exist, that is, when man has yet to be regenerated; for 'field' is a term applying to the Church, that is, to man when regenerate.