Happy to read about the bone therory, as we know that, most of us do not cherish what we have, just remember or cherish what we do not have, that is why they are empty, they do not taste the real happiness. In my point of view, I totally agree with your therory, “Always think about what you have, cherish it as much as you can, do not think about the things you had in the past.” Take the example, we need to take care of the teeth and gum, cos they need to go along with us forever. HAHA! Brush your teeth when you are 95, OK