20 Thy sun shall no more go down; neither shall thy moon withdraw itself: for Yahweh shall be thine everlasting light, and the days of thy mourning shall be ended.
Zion, the metropolis of the Jewish kingdom at its restoration, is said to be the light to which the Gentiles shall come: and in his address to her the prophet saith,
"The sun shall no more be 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 Gods for thy glory: 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."
These are expressions which it is impossible to construe of any thing but of that state of the Jewish kingdom when the Lord Jesus shall be both King and Priest upon its throne; particularly the pronoun thy, limiting the sun spoken of to be that which exclusively pertained to the land of Judea.
Zion's sun and moon shall no more suffer eclipse when Jesus reigns upon his father David's throne in her midst: but now,
"if one look into her land, behold darkness and sorrow, and the light is darkened in the heavens thereof."
These are her days of mourning, in which her glory is eclipsed by the intervention of the orb of the nations between her and her glorious Day-Star, or Sun of Righteousness, who shall soon arise upon her with healing in his wings.
The filling of a kingdom, then, with darkness, is the consequence of its political luminaries being eclipsed; and so long as this darkness continues, they are days of mourning for that kingdom: but let the darkness pass away, from whatever cause, and its sun, moon, and stars shine forth in all their glory, and its people pass into that national condition indicated in the words applied to Zion,
"the days of thy mourning shall be ended."