What does Revelation 21:23 mean?
Ancient cities were often dark. They did not have lighting systems, so they depended upon lighted torches or the light of the sun by day and the light of the moon at night. How different the New Jerusalem is. It enjoys glorious light all the time, as God and the Lamb provide it. The residents of New Jerusalem will never receive an electric bill or experience a blackout. Light will come from God's glory. Neither the moon nor the sun is needed to shine on New Jerusalem. Jesus, the Light of the world (John 1:9; 8:12), serves as the city's lamp.In Old Testament times the shekinah glory shone at various times as God revealed His glory. When Jesus appeared to Saul of Tarsus on the road to Damascus, a brilliant light accompanied Jesus' appearance and blinded Saul (Acts 9:3–9). The apostle John wrote in 1 John 1:5 that "God is light, and in him is no darkness at all."