Ecclesiastes 2:17-20

¹⁷So I hated life; because the work that was wrought under the sun was evil before me: for all is vanity and waywardness of spirit.

¹⁸And I hated the whole of my labour 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 labour in which I laboured, and wherein I grew wise under the sun? this is also vanity.

²⁰So I went about to dismiss from my heart all my labour wherein I had laboured under the sun.