Ecclesiastes 2:17-22

17So I hated life; because the work that is wrought under the sun was grievous unto me: for all is vanity and a striving after wind.

18And I hated all my labour wherein I laboured under the sun: seeing that I must leave it unto the man that shall be after me.

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

20Therefore I turned about to cause my heart to despair concerning all the labour wherein I had laboured under the sun.

21For there is a man whose labour is with wisdom, and with knowledge, and with skilfulness; yet to a man that hath not laboured therein shall he leave it for his portion. This also is vanity and a great evil.

22For what hath a man of all his labour, and of the striving of his heart, wherein he laboureth under the sun?