'Benefit' in the Bible

What benefit do people get from all the effort which they expend on earth?

So I decided to discern the benefit of wisdom and knowledge over foolish behavior and ideas; however, I concluded that even this endeavor is like trying to chase the wind!

What benefit can a worker gain from his toil?

Two people are better than one, because they can reap more benefit from their labor.

The more one argues with words, the less he accomplishes. How does that benefit him?