'Profitless' in the Bible

Yet when I reflected on everything I had accomplished and on all the effort that I had expended to accomplish it, I concluded: "All these achievements and possessions are ultimately profitless -- like chasing the wind! There is nothing gained from them on earth."

Then I considered all the skillful work that is done: Surely it is nothing more than competition between one person and another. This also is profitless -- like chasing the wind.

There is no end to all the people nor to the past generations, yet future generations will not rejoice in him. This also is profitless and like chasing the wind.