Ecclesiastes 2:20-22

²⁰Therefore I began to cause my heart to despair concerning all the labour in which I had laboured under the sun.

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

²²For what does a man have of all his labour and of the striving of his heart, in which he labours under the sun?