Ecclesiastes 1:3

Thus I turned to all my works which my hands had done and the labor which I had labored to do, and behold, all was vanity and striving after wind, and there was no advantage under the sun.

Thus I hated all the fruit of my labor for which I had labored under the sun, for I must leave it to the man who will come after me.

For what does a man get in all his labor and in the striving of his heart with which he labors under the sun?

What advantage is there to the worker from that in which he labors?

This also is a sickening evil—exactly as a man came, so will he go. So what is the advantage to him who labors for the wind?