The world is so unhappy because it is ignorant of the true self. Man's real nature is happiness. Happiness is inborn in the true self. Man's search for happiness is an unconscious search for his true self.

We leave behind something of ourselves wherever we have been.

真相很少是纯粹的，也从来不是简单的。

"The past is always with us, and it shapes who we are and how we see the world."

Ever tried. Ever failed. No matter. Try again. Fail again. Fail better.

解析：心与物相互感应。