Give me a popular quote from book, "The Little Prince".
The Little Prince might look like a children's book from cover, it is a book with full of wisdom bits for all readers. One of the most referred quote is "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."
Instruction: Give me a popular quote from book, "The Little Prince".
Context: 
Response: The Little Prince might look like a children's book from cover, it is a book with full of wisdom bits for all readers. One of the most referred quote is "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."