Ecclesiastes 2:20-22

Therefore I turned about to cause my heart to despair concerning all the labour wherein I had laboured under the sun. For 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. For what hath a man of all his labour, and of the striving of his heart, wherein he laboureth under the sun?