Ecclesiastes 4:4; Ecclesiastes 4:7-8

4 Then I observed that most people are motivated to success because they envy their neighbors. But this, too, is meaningless—like chasing the wind.
7 I observed yet another example of something meaningless under the sun. 8 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.