Ecclesiastes 2:17-20

17And I hated life; for the work that is wrought under the sun was grievous unto me; for all is vanity and pursuit of the wind.

18And I hated all my labour wherewith I had been toiling under the sun, because I should leave it unto the man that shall be after me.

19And who knoweth whether he will be a wise [man] or a fool? yet shall he have rule over all my labour at which I have laboured, and wherein I have been wise under the sun. This also is vanity.

20Then I went about to cause my heart to despair of all the labour wherewith I had laboured under the sun.