Isaiah 60: 19-22.
19 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, and thy God thy glory.
20 Thy sun shall no more go down; neither shall thy moon withdraw itself: for the Lord shall be thine everlasting light, and the days of thy mourning shall be ended.
21 Thy people also shall be all righteous: they shall inherit the land for ever, the branch of my planting, the work of my hands, that I may be glorified.
22 A little one shall become a thousand, and a small one a strong nation: I the Lord will hasten it in His time.
In vv. 19-20, the truth is revealed regarding the glory of God over Israel–it will outshine the light of the sun and the moon: and since the light of the sun will be increased seven-fold in all the earth, and the light of the moon be made equal to the present light of the sun (Is. 30:26), one can have some idea of how bright and light God’s glory will be in Israel.
The photo above captured my attention. It made me think of times that I’ve been driving against the sun, putting down my visor and wearing sunglasses because of the intensity of the light. The light of the sun will be seven times brighter during the Millennium. Think of it!The sun and moon will not be noticed as rising and setting , in Jerusalem, due to the fact that God’s glory will be the light of this city both day and night, and this will be brighter than the light of the sun and moon.
God will be not only the Millennial light, but eternal light for Jerusalem.
The people shall all be righteous: God’s people, Israel, will finally have turned away from the idolatry they practiced for so long. Because of their righteousness, the sins, sicknesses, diseases, calamities, wars, and other aspects of the curse that cause mourning will be past for Israel and all other nations when Christ reigns eternally on earth. For Israel, all this will stop in the Millennium because they will all turn to God and be saved, as explained in v. 21; but among Gentiles there could be individual mourning over death to rebels who break the law during this time (Is. 65:20). In the new earth, however, all this will be done away for all people (Rev. 21:3-7; 22:3).
The idea in vv. 21-22 is that of great increase in families and nations when no one will die in the Millenium except rebels who break the law during this period, or take part with Satan in the revolt at the close of this age Rev.20:7-10). There will be no death at all in the new and eternal earth (I Cor. 15:4-28; Rev. 21:3-7).