Ecclesiastes 4:4, 8

Then I observed that most people are motivated to success because they envy their neighbors. But this, too, is meaningless—like chasing the wind.

This is the case of a man who is all alone, without a child or a brother, yet who works hard to gain as much wealth as he can. But then he asks himself, “Who am I working for? Why am I giving up so much pleasure now?” It is all so meaningless and depressing.