Money is a device that started as a solution beyond the barter system. It was not complicated. It was just a means of exchange; a tool to make life more comfortable. If money is in your pocket, life is more comfortable. But the moment it enters your head, it becomes a perversion. You get identified by it. It becomes who you are. Once you get identified by it, you can never have enough.
There are many wealthy people who become miserable with just a little fluctuation in their net worth. But money is merely a means to an end. Like everything else, money has been created for our well-being. We forget this when we become deeply identified by it.
Instead of just having money to use, we become someone — or something — because of it. Then we begin to compare ourselves to other people instead of enjoying what we have. This becomes a kind of a sickness, where making money is then turned against your own well-being.