Isaiah58-60 WestLoop Why How What. "They will call you the City of the Lord, and Zion of the Holy One of Israel" (Isa 60:14b, NLT). "For the Lord will be your everlasting light. Your days of mourning will come to an end" (Isa 60:20b, NLT).
"In the old order of creation, life was governed rigidly by night and day and unpredictably by the fitfulness of sun and moon. But in the new order of salvation, the ruling principle is the changeless presence of the Lord." Alec Motyer.
Isaiah 60 may be the (best Old Testament) picture of the world to come, i.e., of ultimate reality.
Revelation 21 draws freely for its picture of the radiant city from heaven. Isaiah 56-66 primarily addresses the dispersed Israelites who have returned to Jerusalem from Babylon. But the description in Isaiah 60 point far beyond the return from exile. The walls are not going to be built by Jews but by foreigners, and the gates of the city will ever be open. It is an idealised Jerusalem that is depicted--one that speaks of the eschatological days of redemption and bliss.