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.

8767. 'And keep My covenant' means thus leading a good life, and as a consequence being joined [to the Lord]. This is clear from the meaning of 'keeping the covenant' as leading a life in accordance with the commandments, thus a life governed by good, and so being joined to the Lord. The reason why 'keeping the covenant' means leading a life in accordance with the commandments, thus leading a good life, is that the stipulations of the covenant were all the things that had been commanded, which were called testimonies, judgements, laws, and statutes, in particular the Ten Commandments. All these were also called the covenant because it was established through them. The fact that keeping them is leading a life in accordance with them is evident from the meaning of 'keeping' in the Word. Many times it speaks of hearing the commandments and keeping them, and in those places 'hearing' means accepting them in faith, and 'keeping' accepting them in life, that is, leading a life in accordance with them. The reason why 'keeping the covenant' also means being joined [to the Lord] is that in an overall sense 'a covenant' means being joined together, 665, 666, 1023, 1038, 1864, 1996, 2003, 2021, 6804. It has this further meaning because a person who leads a life in accordance with the commandments is joined to the Lord. For the commandments teach about life and also impart life, thereby opening the way to heaven and opening one's eyes to see the Lord.