Ecclesiastes 2:21-23

21st Century King James Version

²¹ For a man may labor in wisdom and in knowledge and in equity; yet to a man who hath not labored therein shall he leave it for his portion. This also is vanity and a great evil.

²² For what hath man for all his labor and for the vexation of his heart wherewith he hath labored under the sun?

²³ For all his days are sorrows and his travail grief. Yea, his heart taketh not rest in the night. This is also vanity.