Lev Grossman said this quote

This is a feeling that you had, Quentin,' she said. 'Once, a very long time ago. A rare one. This is how you felt when you were eight years old, and you opened one of the Fillory books for the first time, and you felt awe and joy and hope and longing all at once. You felt them very strongly, Quentin. You dreamed of Fillory then, with a power and an innocence that not many ever experience. That's where all this began for you. You wanted the world to be better than it was.