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What secret does the fox share with the little prince?

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French postage stamp featuring an illustration of the Little Prince in a blue and red coat, with text reading Le Petit Prince and Republique Francaise, and a value of 3,00. — The Little Prince *Le Petit Prince* (*The Little Prince*) pictured on a French stamp, circa 1998.

In the fable The Little Prince by Antoine de Saint-Exupéry, the fox shares a profound secret with the little prince that serves as the central theme of the story: "It is only with the heart that one can see rightly: what is essential is invisible to the eye."1