Isaiah 60:19

The eschatological promise that 'the sun shall be no more thy light by day; neither for brightness shall the moon give light unto thee: but the Lord shall be unto thee an everlasting light' radically relativises the cosmos's greatest light-sources by envisioning God's own luminosity as their replacement. Revelation 21:23 ('the city had no need of the sun, neither of the moon…for the glory of God did lighten it, and the Lamb is the light thereof') quotes this verse almost verbatim, making it the canonical description of the new Jerusalem's light source. The verse stands within Isaiah 60's vision of Zion's future glory, in which the nations and their kings stream to Zion's light (vv. 1-5) — a vision explicitly christologically applied in Matthew 2's magi narrative and Simeon's Nunc Dimittis (Luke 2:32). The verse grounds Christian contemplative traditions that speak of the beatific vision as participation in uncreated divine light.