I think money is a massive source of worry for many people for good reasons. But once you have food, shelter, friends and something to do that makes you feel useful, a person doesn't really need much more than that.

So at that point, as long as you have those basics, a grateful abundance mindset is the key to a happy life.

And if you don't have that mindset, you can be a thousand times richer and still be completely miserable.