In an interview with Marvin Smalheiser, (founder, publisher and editor of Tai Chi Magazine, founded Wayfarer Publications in 1981 ),Duan Zhi Liang was asked how one achieves longevity.  In a long and detailed answer, one element was the emotional element:

“Maybe some person will bother you or a virus will bother you.  It can be many, many things.  So you need to struggle.  How do you struggle?  You need to love people….Always have an open heart and open emotions.

Keep happy and take care of your emotions very well.  And forget yesterday.”  Forget Yesterday!