"'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.
"'It is the time you have devoted to your rose that makes your rose so important.'
"'It is the time I have devoted to my rose - ' said the little prince, so that he would be sure to remember.
"'Men have forgotten this truth,' said the fox. 'But you must not forget it. You become responsible, forever, for what you have tamed. You are responsible for your rose.'"
Antoine De Saint-Exupery, The Little Prince.