The philosophy here is that being rich is equal to being happy with the things that you have.
If you are happy with having three children, then you are rich.
If you are happy working in a factory, then you are rich.
If you are content to walk on the beach, and you ARE walking on the beach, then you are rich.
People often confuse being rich with being wealthy.
If you have enough money to buy the beach, then you are wealthy. If you enjoy walking on your new beach, then you are rich.
I hope that helps!