Jerusalem, on Mount Zion, signifies the doctrine of love to the Lord, and how it governs your life. Jerusalem first comes to our attention in 2 Samuel 5, when King David takes the city from the Jebusites and makes it his capital. In the next chapter he brings the Ark of the Covenant there, and later it is where Solomon builds the temple, and his own palace. From then on Jerusalem is the center of worship of the Israelitish church. It is the place where the Lord was presented in the temple as a baby, where He tarried to talk to the priests at age twelve, where He cleansed the temple, had the last supper, was crucified and then rose. It is a central place in both the old and new Testaments. The city was built on Mount Zion, the highest point of the mountains of Judea. A city, in the Word, represents doctrine, the organized knowledge of the truths of the church. Mountains represent love of the Lord and the consequent worship. If you put those things together, Jerusalem on Mount Zion signifies the doctrine of love to the Lord, and how it governs your life. This is why David was led to make Jerusalem the most important city of the land, and why all worship was conducted there. And this is also why Jeroboam was condemned for introducing idol worship in Samaria. In the Book of Revelation, John's vision of the city New Jerusalem descending from God is a prophecy of a new dispensation of doctrine coming from the Lord.

(References: Arcana Coelestia 4539, 8938; The Apocalypse Explained 365 [35-38])

6310. A person's interiors are divided into separate degrees through derivation from one another; and in keeping with those degrees they also differ in the level of light they possess. The light on the internal sensory level next to the bodily senses is the dullest, a light that much experience has enabled me to recognize. I have also noticed that every time I have descended to this degree of light falsities and evils of many a kind have presented themselves, indeed even slanders against what is heavenly and Divine, not to mention things of a foul and disgusting nature. The reason why is that this kind of light prevails in hell, and hell enters a person by means of this light especially.

[2] When this is the kind of light a person has, his thought possesses virtually the same kind of light as his external sight, and takes place almost on the level of the body. People who see in this kind of light must be called sensory-minded, for their thought does not rise beyond sensory impressions received by the body. Such people do not have any perception of or belief in things that lie beyond the senses; they believe only what they can see and touch. This is the light that people see by who have not devoted any attention whatever to more internal things; in life they have neglected or treated with contempt everything of a rational or spiritual nature. It is the light that avaricious persons and adulterers in particular see by, also those who have led lives of mere pleasure-seeking or lives that have been disgustingly lazy. The thoughts of such people are consequently foul, and they often entertain disgraceful attitudes towards the holy things of the Church.