The firmament of heaven represents mutual love. The firmament, as in Genesis 1, signifies the internal man.

(References: Arcana Coelestia 24)

In the Word, 'Satan' signifies people who are caught up in the pride of self-derived intelligence.

'Satan' 'the devil,' and 'the prince of the world,' signify hell. (True Christian Religion 116)

(References: Apocalypse Revealed 97, 841)