הֶ֣בֶל הֵ֔מָּה מַעֲשֵׂ֖ה תַּעְתֻּעִ֑ים בְּעֵ֥ת פְּקֻדָּתָ֖ם יֹאבֵֽדוּ׃
They are vanity, a work of delusion; In the time of their visitation they shall perish,
Read kabbalistic (mystical) interpretation of Jeremiah 51:18: and classical mystical sources.