I am not quite sure what made me, in a particular year of my life, feel that not only a fairy tale, but a fairy tale addressed to children, was exactly what I must write—or burst. Partly, I think, that this form permits, or compels you to leave out things I wanted to leave out. It compels you to throw all the force of the book into what was done and said. It checks what a kind, but discerning critic called ‘the expository demon’ in me. It also imposes certain very fruitful necessities about length.
