Ecclesiastes 2:17-22

17So I hated life, because the work that is done under the sun was grievous to me. For everything is futile and a pursuit of the wind.

18I hated all for which I had toiled under the sun, because I must leave it to the man who comes after me. 19And who knows whether that man will be wise or foolish? Yet he will take over all the labor at which I have worked skillfully under the sun. This too is futile.

20So my heart began to despair over all the labor that I had done under the sun. 21When there is a man who has labored with wisdom, knowledge, and skill, and he must give his portion to a man who has not worked for it, this too is futile and a great evil. 22For what does a man get for all the toil and striving with which he labors under the sun?