רַעְיוֹן

So I set my mind to know wisdom and madness and folly; I learned that this, too, is a pursuit of the wind.

For what does a man get for all the toil and striving with which he labors under the sun?

There is no limit to all the people who were before them. Yet the successor will not be celebrated by those who come even later. This too is futile and a pursuit of the wind.