Matthew Poole and continuators on Isaiah 60:20

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 .

Literally he means the Jews mourning in Babylon; but especially the uninterrupted happiness of the Church; the Hebrew here for ended signifies recompensed, their days of rejoicing shall abundantly recompense all their days of mourning.