NET
9 While applying my mind to everything that happens in this world, I have seen all this: Sometimes one person dominates other people to their harm.
Darby
9 All this have I seen, and applied my heart unto every work that is done under the sun: there is a time when man ruleth man to his hurt.
KJV
9 All this have I seen, and applied my heart unto every work that is done under the sun: [there is] a time wherein one man ruleth over another to his own hurt.