ECC 4:8

8 There are men who live alone; they do not have a wife or children or any brothers living with them; every day they work [very hard], without stopping, to get a lot of money, but they are never satisfied with the things that they have. They never ask [themselves], “Why am I working very hard to earn more money? Why am I not doing things that would cause me to be happy?” What they do also seems senseless.