King James Version (KJV)
I said in mine heart, Go to now, I will prove thee with mirth, therefore enjoy pleasure: and, behold, this also is vanity.
Modern English
I said in my heart, "Come now, I will test you with pleasure; enjoy yourself." But behold, this also was vanity.
Hebrew
אָמַ֤רְתִּי אֲנִי֙ בְּלִבִּ֔י לְכָה נָּ֛א אֲנַסְּכָ֥ה בְשִׂמְחָ֖ה וּרְאֵ֣ה בְטוֹב֑ וְהִנֵּ֥ה גַם הוּא הָֽבֶל׃
ʾamartiy ʾaniy blibiy lkah naʾ ʾanaskah bshimḥah vrʾeh bṭvob vhineh gam hvʾ habel