אָמַ֤רְתִּֽי אֲנִי֙ בְּלִבִּ֔י לְכָה־נָּ֛א אֲנַסְּכָ֛ה בְשִׂמְחָ֖ה וּרְאֵ֣ה בְט֑וֹב וְהִנֵּ֥ה גַם־ה֖וּא הָֽבֶל׃
Footnotes to Kohelet by Bruce Heitler
Kohelet looks inward, but still from the perspective of this world, the world under the sun. Even goodness and joy look unsatisfying from this perspective.