Ecclesiastes 8:9

"All this. have seen and applied my mind to every deed that has been done under the sun wherein. man has exercised authority over another man to his hurt".

Solomon isn't presenting. theory, rather he is speaking from personal experience and observation. Once again we see that Solomon had given whole-hearted attention to the problems associated with life under the sun.

"to his hurt" -Nobody wins when one man is oppressing another or others. The oppressed suffer and the oppressor stores up for themselves divine judgment. "the wisdom of patient fidelity to duty, the perniciousness of revolutionary selfishness, and the suddenness which with the judgment comes, he has seen with his own eyes, at the time when man ruled over man" (Keil/Del. p. 345).