Revelation 21:9-23

Come, and I will show you the Bride. Under the symbolism of [spiritual] Jerusalem, the New Jerusalem, the wife of the Lamb [the church of Christ] is described. This Holy City is the Church Triumphant [the glorified church of the future]. Even the Church Militant [the church here on earth] gleams with this glory, SINCE THERE IS BUT ONE CHURCH! TO show the VALUE of Christ's Bride [his church], the Holy City is constructed out of everything this world thinks so valuable. Gold, every kind of precious jewel and stone - these things are used like common brick and mortar to build this city! The city is a perfect cube, 1,500 miles on a side, symbolic of the perfection of Christ's church [the Kingdom of God]. The Most Holy Place in the Jewish Temple was also a perfect cube. The city shines with the glory of God, and has no need for a "sun" or a "moon" (Revelation 21:23). The great, high wall is symbolic of protection and safety. God's people will be free from worry and sorrow forever (see Revelation 7:14-17).