Having read the linked Bible passage, I think it probably means "A wise man is humble. We are all dust in the wind. Nothing you do matters anywhere near as much as most people like to imagine."
In a thousand years, the sun will still rise. The wind will still blow. Your name will probably not be remembered.
We have trouble coming up with solid info on historic kings. We know vastly less about historic commoners.
Even if you are relatively well off and important in the world today, in the grand scheme of things, you still don't really matter all that much. So check your ego at the door.
