Ecclesiastes 4:4; Ecclesiastes 4:7-8
I also observed that people work hard and become good at what they do only out of mutual envy. This too is pointless, just wind chasing.
Next, I saw under the sun something else that was pointless:
There are people who are utterly alone, with no companions, not even a child or a sibling. Yet they work hard without end, never satisfied with their wealth. So for whom am I working so hard and depriving myself of enjoyment? This too is pointless and a terrible obsession.