Ecclesiastes 2:11

I made a serious review of my former works and labours, and considered whether I had obtained that satisfaction in them which I designed and expected; and, behold, all was vanity and vexation of spirit; I found myself suddenly disappointed and wholly dissatisfied in this course. There was no profit; the pleasure was past and gone, and I was never the better for it, but as empty as before, and had nothing left but sorrowful reflections upon it.