Winniee, the calculation sentence is just one confusion in my mind for a long time. I did not derive it from your post:)

The other day, I was chating with a campus shuttle drive. Believe it or not, he is more than 70. We asked him the reason for being healthy. He said, being truthful.

If we could be truthful to ourselves then to others around us, what a beautiful world it is! Thank you all for your responses. I realized something I never paid attention to.