Ecclesiastes 2:18-23

18I also hated all the fruit of my toil for which I had labored under the sun, because I must leave it to the one who comes after me.

19Who knows if he will be wise or a fool? Yet he will be master over all the fruit of my toil for which I had wisely labored under the sun. This too is futile.

20So I turned my heart over to despair over all the things for which I had toiled under the sun.

21For sometimes a man, who has labored with wisdom, knowledge and skill, must hand over as an inheritance to someone who did not work for it. This also is futile and a great misfortune.

22For what does a man get for all his toil and longing of his heart for which he labors under the sun?

23For all his days, his work is pain and grief. Even at night his mind does not rest. This also is futility.