You know this is true if you remember your childhood. You know this is true if you watch your own children playing. They seem to be able to find happiness in the most simple and common things.
Remember the time you bought some new toys for your child to play with, and what did they do? Play with the new toys? No, they grabbed that cardboard box, pushed it around, pulled it, crawled into it and threw their new toys into the box and played and had fun. They were happy Their happiness was derived from a common and simple item.
Maybe it is time for us to look around to see our happiness in the common and simple things. Who knows, we might find a cardboard box!