ECCLESIASTES 2:20-23

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?

²³For all his days are but sorrows, and his travail is grief; yea, even in the night his heart taketh no rest. This also is vanity.