לֹא־יָב֥וֹא עוֹד֙ שִׁמְשֵׁ֔ךְ וִירֵחֵ֖ךְ לֹ֣א יֵאָסֵ֑ף כִּ֣י יְהוָ֗ה יִֽהְיֶה־לָּךְ֙ לְא֣וֹר עוֹלָ֔ם וְשָׁלְמ֖וּ יְמֵ֥י אֶבְלֵֽךְ׃
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.
Read kabbalistic (mystical) interpretation of Isaiah 60:20: and classical mystical sources.