A Very Simple Secret!

Every once in a while, sometimes everyday, I need to remind myself of this very simple secret!

  

And he went back to meet the fox.

"Goodbye," he said.

"Goodbye," said the fox. "And now here is my secret, a very simple secret: It is only with the heart that one can see rightly; what is essential is invisible to the eye."

"What is essential is invisible to the eye," the little prince repeated, so that he would be sure to remember. [...]
(Antoine de Saint-Exupéry, The Little Prince, Chapter 21(the Fox),1943)