3624. THE CORRESPONDENCE WITH THE GRAND MAN, WHICH IS HEAVEN, OF ALL THE ORGANS AND LIMBS, BOTH INTERIOR AND EXTERIOR, OF THE HUMAN BEING

Let me now tell of and describe marvels which, so far as I know, have not as yet been known to anyone, nor has even the idea of them entered anyone's head - the marvel that the whole of heaven has been formed in such a way that it corresponds to the Lord, to His Divine Human; also the marvel that the human being has been formed in such a way that every single part of him corresponds to heaven, and through heaven to the Lord. This is a great mystery which is now to be revealed, it being the subject here and at the ends of chapters that follow this.

Darkness" is a state without light. "Light" is truth from the Lord, so "darkness" represents a state where truth is lacking. Here's a cogent passage from Arcana Coelestia: "The person who has yet to be regenerated is called 'a void and an empty earth', and also 'ground', in which no good or truth at all has been sown - 'void' where there is no good, and 'empty' where there is no truth. Consequently there is 'thick darkness', or stupidity and lack of knowledge about anything that has to do with faith in the Lord and so anything that has to do with spiritual and celestial life. (Arcana Coelestia 17)