This chapter opens with New Heaven and New Earth. As much as, "In the Beginning," this sentence changes everything. How could so many of the promises, allusions, and hopes be tied together in one sentence. Beautiful.
The beauty of the new Jerusalem is beyond description. The glory of it radiates from and reflects the Lamb. It is HIS city.
The language of God's covenants echoes throughout. "I will be their God. They will be my people."