When you think of a book that talks about purity and nostalgia for childhood, this is it, Saint-Exupéry made this masterpiece in the form of a "children's book" but the adults who most need to know about this book are always cold trying to hide the innocent side of each one in the veil that they lead a serious and professional life.
This escapism exemplified by the cartographer, drunk, accountant, lamplighter and king very well in which everyone lives this adult (and lying) life to the letter while the Little Prince lives for simple but important things like watching the sunset in his planet and love his beautiful rose.