Arcana Coelestia #35
35. Man has two inherent powers of will and understanding. When the understanding is governed by the will they then constitute one mind and so one life; for what a person in that case wills and does he also thinks and intends. But when the understanding is at variance with the will, as it is with people who claim to have faith and yet live otherwise, then a mind previously one is split in two. One half seeks to transport itself into heaven, while the other inclines towards hell. And because the will is what accomplishes everything, the whole man would rush straight into hell unless the Lord took pity on him.
Deeps
In Genesis 1:2; 7:11, this signifies deeply rooted selfish desires and the falsities from them. (Arcana Coelestia 18, 756) The deeps mentioned in Psalms 148:7 signify the ultimate heavens, in which the spiritual-natural angels and divine truths are in abundance with the arcana of divine wisdom.
(References: Apocalypse Explained 538)