"I’ve always been interested in the Mother Goddess. Not long ago, a young person, whom I don’t know very well, sent a message to a mutual friend that said: “I’m an addict of Mary Poppins, and I want you to ask P. L. Travers if Mary Poppins is not really the Mother Goddess.” So, I sent back a message: “Well, I’ve only recently come to see that. She is either the Mother Goddess or one of her creatures — that is, if we’re going to look for mythological or fairy-tale origins of Mary Poppins.” I’ve spent years thinking about it because the questions I’ve been asked, very perceptive questions by readers, have led me to examine what I wrote. The book was entirely spontaneous and not invented, not thought out. I never said, “Well, I’ll write a story about Mother Goddess and call it Mary Poppins.” It didn’t happen like that. I cannot summon up inspiration; I myself am summoned."