עַל־זֹאת֙ תֶּאֱבַ֣ל הָאָ֔רֶץ וְקָדְר֥וּ הַשָּׁמַ֖יִם מִמָּ֑עַל עַ֤ל כִּי־דִבַּ֙רְתִּי֙ זַמֹּ֔תִי וְלֹ֥א נִחַ֖מְתִּי וְלֹא־אָשׁ֥וּב מִמֶּֽנָּה׃
For this shall the earth mourn, And the heavens above be black; Because I have spoken it, I have purposed it, And I have not repented, neither will I turn back from it.
Read kabbalistic (mystical) interpretation of Jeremiah 4:28: and classical mystical sources.