“Wisest is she who knows she does not know.”

 "All mortals are born at the very tip of the rabbit's fine hairs, where they are in position to wonder at the impossibility of the trick. But as they grow older they work themselves deeper into the fur," (pg 18). That alone, I feel sums up Gaarder's definition of people. Those who have decided that the world should only be one way and refuse to believe any other possibilities and those who continue to ponder over philosophical issues. Sophie would fall into both categorize because though she isn't as narrow minded as the ones at the roots she too is beginning her downward climb. "Watch out! You are on thin ice," Gaarder warns her.
Though, I agree with Gaarder I think that it would be hard for anyone to be completely at the tip. Once you've figured something out,  like Copernicus figured out that the sun is at the center of the universe and not the earth, he had of settled into this belief and therefore was beginning to climb down the rabbit's hair.  Once he had figured out the heliocentric theory he was satisfied with it and didn't question there being another possibility.If all of a sudden, another planet were to take the sun's place at the center I'm sure Copernicus would be quite confused. This is similar to Gaarder's example of the mother freaking out over the fact that her husband had just floated out of his seat. If she hadn't been accustomed to the fact that people do not float she wouldn't have been so shocked. Just like most philosophers after coming up with a theory they believe to be right that becomes their truth. Because Copernicus had questioned the geocentric theory, unlike most adults who wouldn't have given much thought to it since that is what they were always taught, he isn't at the bottom of the fur but once he had found his theory and decided it to be right he was knocked off the tip.