Ecclesiastes 2:18-20

¹⁸And I hated the whole of my labor Which I took under the sun; Because I must leave it to the man who will come after me.

¹⁹And who knows whether he will be a wise man or a fool? And whether he will have power over all my labor In which I labored, and wherein I grew wise under the sun? This is also vanity.

²⁰So I went about to dismiss from my heart All my labor wherein I had labored under the sun.