879. 21:2 Then I, John, saw the holy city, New Jerusalem, coming down from God out of heaven. This symbolizes the New Church to be established by the Lord at the end of the previous one, which will be affiliated with the New Heaven and possess Divine truths in its doctrine and in its life.

John mentions himself by name here, saying "I, John," because as an apostle he symbolizes the goodness of love toward the Lord and the attendant goodness of life. Consequently he was more loved than any of the rest of the apostles, and at the Last Supper he reclined on the Lord's breast (John 13:23; 21:20). And this church, which is the subject here, has a similar symbolism.

That Jerusalem symbolizes the church will be seen in the next number. It is called a city and described as a city because of its doctrine and its life in accordance with that doctrine. For a city in the spiritual sense symbolizes doctrine (nos. 194, 712). It is called a holy city owing to the presence of the Lord, who alone is holy, and owing to the Divine truths from the Word that it has in it from the Lord, which are called holy (nos. 173, 586, 666, 852). And it is called new, because He who sat on the throne said, "Behold, I am making all things new" (Revelation 21:5). It is also said to be coming down from God out of heaven because it descends from the Lord through the New Christian Heaven, as said in no. 876 in the exposition of verse 1 in this chapter. For the church on earth is formed by the Lord through heaven, in order that heaven and the church may be in harmony and affiliated.

852. 20:6 Blessed and holy is he who shares in the first resurrection. This symbolically means that through conjunction with the Lord those who enter heaven enjoy the felicity of eternal life and enlightenment.

That person is called blessed who has the felicity of eternal life (no. 639). And that person is called holy (or a saint) who has enlightenment in Divine truths through conjunction with the Lord. For the Lord alone is holy, and the Divinity emanating from Him which produces enlightenment is what is called the Holy Spirit (nos. 173, 586, 666). The first resurrection symbolizes the Lord's raising a person into heaven and thus salvation, as in no. 851 above.

It is apparent from this that "blessed and holy is he who shares in the first resurrection" symbolically means that through conjunction with the Lord, those who enter heaven enjoy the felicity of eternal life and enlightenment.