Why does the quote from Antoine de Saint-Exupery appear at the beginning of Jack’s part of the story? (p.133)

Can you quote the line for me?

" Now here is my secret. It is very simple. It is only with one's heart that one can see clearly. What is essential is invisible to the eye."

This directly relates to people seeing past Auggie's different looking face to see what an extra-ordinary individual he really is. Characters that do this in the story are rewarded when they get to know him.