916. 21:21 The twelve gates were twelve pearls: each gate was of one pearl. This symbolically means that an acknowledgment and concept of the Lord join all the concepts of truth and goodness in the Word into one and introduce into the church.

The twelve gates symbolize in sum the concepts of truth and goodness by which a person is introduced into the church (nos. 899, 900). Twelve pearls also symbolize in sum concepts of truth and goodness (no. 727). That is why the gates were pearls. Each gate was of one pearl because all the concepts of truth and goodness symbolized by the gates and by pearls relate to a single concept, one that is their containing vessel, and that single concept is a concept of the Lord. We say, a single concept, even though there are many that make up that single concept, for a concept of the Lord pervades all other doctrinal concepts, and so all concerns having to do with the church. All matters of worship take their life and soul from that concept, for the Lord is everything in the whole of heaven and the church, and so in the whole of worship.

[2] An acknowledgment and concept of the Lord join all the concepts of truth and goodness in the Word into one because all spiritual truths are connected, and if you would believe it, their connection is like the connection between all the members, viscera and organs of the human body. Consequently, as the soul holds everything together in their organization and connection, so that they are sensed only as a unit, so the Lord holds together all the spiritual truths that a person possesses.

That the Lord is the true door by which one is to enter into the church and so into heaven, He Himself teaches in John:

I am the door. If anyone enters by Me, he will be saved... (John 10:9)

And that an acknowledgement and concept of Him is the true pearl is meant by these words of the Lord in Matthew:

...the kingdom of heaven is like a merchant seeking beautiful pearls, who, when he had found one precious pearl, went and sold all that he had and bought it. (Matthew 13:45-46)

The one precious pearl is an acknowledgment and concept of the Lord.

727. And pearls. This symbolizes the concepts of goodness and truth contained in the Word among Roman Catholics.

In the spiritual sense pearls symbolize concepts of both celestial and spiritual goodness and truth that come from the Word, in particular from its literal meaning; and because pearls symbolize those concepts, therefore they are mentioned after purple and scarlet and after gold and precious stones.

These concepts are symbolized by pearls also in the following passages:

...the kingdom of heaven is like a merchant seeking beautiful pearls, who, when he had found one pearl of great price, went and sold all that he had and bought it. (Matthew 13:45-46)

The pearl here symbolizes a concept of the Lord.

The twelve gates (in the wall of the New Jerusalem) were twelve pearls: each individual gate was of one pearl. (Revelation 21:21)

The gates of the New Jerusalem symbolize entrance into the New Church, and the entrance is made possible by concepts of goodness and truth from the Word.

Do not... cast your pearls before swine, lest they trample them under their feet, and... tear you in pieces. (Matthew 7:6)

Swine symbolize people who care only for worldly wealth, and not for spiritual wealth, namely for concepts of goodness and truth from the Word.

Because Babylon symbolizes a religion that has cast out all concepts of goodness and truth from the Word, we are told concerning it:

The merchants of the earth will weep and mourn over (Babylon), because no one buys their merchandise...: merchandise of gold and silver, precious stones, and pearls... (Revelation 18:11-12)