In Ezekiel 16:7, the breast signifies natural good.

(Odkazy: Arcana Coelestia 3301)

In Exodus 29:26, this signifies the divine spiritual in the heavens and its appropriation there. It also signifies the good of charity. (Arcana Coelestia 10087)

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)