אָמַ֤רְתִּֽי אֲנִי֙ בְּלִבִּ֔י לְכָה־נָּ֛א אֲנַסְּכָ֛ה בְשִׂמְחָ֖ה וּרְאֵ֣ה בְט֑וֹב וְהִנֵּ֥ה גַם־ה֖וּא הָֽבֶל׃
I said in my heart: ‘Come now, I will try thee with mirth, and enjoy pleasure’; and, behold, this also was vanity.
Read kabbalistic (mystical) interpretation of Ecclesiastes 2:1: and classical mystical sources.