Here is more about New Jerusalem from Affirmation & Critique,* The New Jerusalem—The Consummation of God’s Work in Humanity (by David Yoon):
Throughout church history, the mystery of God’s purpose and that of man’s destiny have been a continuous source for debate and discussion among Christians. According to the divine revelation in the Holy Scriptures, the ultimate answer to these two mysteries is presented in the final vision of the Bible—the vision of the New Jerusalem, the holy city. This vision, described in Revelation 21 and 22, concludes the entire Scriptures and completes the progression of the divine revelation concerning God and His interaction with humankind. As the consummating vision in the Bible, the New Jerusalem unveils the ultimate issue of God’s work upon His elect, the final state of their perfection through their participation in His great salvation (Heb. 2:3). The accomplishment of God’s purpose and the fulfillment of humanity’s destiny culminate and converge in the New Jerusalem.
As stated here, New Jerusalem is the ultimate issue of God’s work in His people. This work includes His foreknowledge, selection, and predestination in eternity past; the creation of man; redemption by Jesus Christ; proclaiming of the gospel; our regeneration, transformation, and glorification; and the building up of the Body of Christ which is the house of the living God, the forerunner of New Jerusalem.
All the steps from eternity through redemption are outside of us. Beginning from regeneration, the Triune God’s work upon us is His work in us: the Father— “it is God who operates in you” (Phil. 2:13), the Son— “Christ may make His home in your hearts” (Eph. 3:17), and the Spirit—He gives life “through His Spirit who indwells you” (Rom. 8:11).
Also, the building up of the Body of Christ is by our growth in life—the life which is Christ in us. Our growth is His increase within us. Eventually, Christ will come “to be glorified in His saints” (2 Thes. 1:10). This completes the Triune God’s work in us and causes us to match New Jerusalem, “having the glory of God.”
* Affirmation & Critique is a Christian Journal published twice a year and available online. It presents Bible truths in a scholarly manner, with references to and citations from a variety of publications by authors over the entire Christian era. Affirmation & Critique exhibits much appreciation for the person and work of Jesus Christ and our life with Him. The Fall 2012 issue (Vol. XVII, No. 2) focuses on New Jerusalem.