898. 21:12 It had a great and high wall. This symbolizes the Word in its literal sense from which the doctrine of the New Church comes.

Since the holy city Jerusalem means the Lord's New Church in respect to its doctrine, its wall can only mean the Word in its literal sense, from which its doctrine comes; for the literal sense protects the spiritual meaning that lies within, as a wall protects a city and its inhabitants.

That the literal sense is the foundation, containing vessel, and buttress of the Word's spiritual meaning may be seen in The Doctrine of the New Jerusalem Regarding the Sacred Scripture, nos. 27-36; and that the literal sense serves as a safeguard to keep the Divine truths within from being injured - truths which constitute the Word's spiritual meaning - may be seen in no. 97 of the same work. Also, that the church's doctrine is to be drawn from the Word's literal sense and verified by it, in nos. 50-61 there.

The wall is said to be great and high because it means the Word in respect to its Divine goodness and Divine truth, for greatness is predicated of goodness, and height of truth, as in no. 896 above.

[2] A wall symbolizes something that protects, and when mentioned in reference to the church, it symbolizes the Word in its literal sense, as it does also in the following places:

I have set watchmen on your walls, O Jerusalem; they shall not keep silent day or night, who make mention of Jehovah... (Isaiah 62:6)

They shall call you the City of Jehovah, the Zion of the Holy One of Israel... And you shall call your walls salvation, and your gates praise. (Isaiah 60:14, 18)

(Jehovah) will be a wall of fire all around her, and... the glory in her midst. (Zechariah 2:5)

Men of Arvad... were on your walls..., and the men of Gammad... hung their shields on your walls all around, and made your beauty perfect. (Ezekiel 27:11)

The last is said of Tyre, which symbolizes the church in respect to its concepts of truth from the Word.

Run about through the streets of Jerusalem, and see... if there is anyone who... seeks the truth... Go up on her walls and cast them down. (Jeremiah 5:1, 10)

Jehovah has purposed to destroy the wall of the daughter of Zion... ...He has caused the rampart and wall... to lament, to languish together... The Law and her prophets are no more... (Lamentations 2:8-9)

They will run about in the city, they will run on the wall; they will climb up into the houses, they will enter through the windows... (Joel 2:9)

These passages refer to falsifications of truth.

Day and night (the impious) go around (in the city) on its walls... Destructions are in their midst. (Psalms 55:10-11)

And so on elsewhere, as in Isaiah 22:5; 56:5; Jeremiah 1:15; Ezekiel 27:11; Lamentations 2:7.

That a wall symbolizes the Word in its literal sense is clearly apparent from the following verses in the present chapter, which describe at some length the wall of the city and its gates, foundations and dimensions. That is because the doctrine of the New Church, which the city symbolizes, comes only from the Word's literal sense.

896. 21:10 And he carried me away in the spirit onto a great and high mountain, and showed me the great city, the holy Jerusalem, descending out of heaven from God. This symbolizes John's being transported into the third heaven and his sight opened there, and the Lord's New Church in respect to its doctrine being presented to him in the form of a city.

John's being carried away in the spirit onto a great and high mountain means, symbolically, that he was transported into the third heaven, where those people dwell who are impelled by love from the Lord and possess a doctrine of genuine truth from Him. Greatness is also predicated of goodness, and height of truths.

His being carried away onto a mountain symbolically means into the third heaven, because he is said to have been in the spirit, and someone who is in the spirit is as to his mind and sight in the spiritual world. Moreover, in the spiritual world angels of the third heaven dwell on mountains, angels of the second heaven on hills, and angels of the lowest heaven in valleys between the hills and mountains. Consequently, when someone is carried away in the spirit onto a mountain, it symbolically means into the third heaven. This carrying away takes place in a moment, because it is achieved by a change in the person's state of mind.

The angel's showing to John symbolizes his sight being opened then and a revelation. The great city, the holy Jerusalem, coming down out of heaven from God symbolizes the Lord's New Church, as in nos. 879, 880 above, where we also explained why it is called a holy city, and why it is said to be coming down out of heaven from God. It was seen in the form of a city because a city symbolizes doctrine (nos. 194, 712), and a church is a church by virtue of its doctrine and its living in accordance with that doctrine. It was also seen as a city in order that its whole character might be described, and this is described by the city's walls, gates, foundations, and various dimensions.

The church is similarly described in Ezekiel, where we are also told that the prophet was taken in the visions of God onto a very high mountain, where he saw a city to the south, whose wall and gates an angel also measured, together with its various widths and heights (Ezekiel 40:2ff.).

The following passage in Zechariah has a similar meaning:

I said (to the angel), "Where are you going?" He said..., "To measure Jerusalem, to see how great its width is and how great its length." (Zechariah 2:2)