Neil Gaiman said this quote
“ Richard put away the Narnia books, convinced, sadly, that they were an allegory; that an author (whom he had trusted) had been attempting to slip something past him. He had had the same disgust with the Professor Challenger stories, when the bull-necked old professor became a convert to Spiritualistm; it was not that Richard had any problems believing in ghosts - Richard believed, with no problems or contradictions, in everything - but Conan Doyle was preaching, and it showed through the words. Richard was young, and innoncent in his fashion, and believed that authors should be trusted, and that there should be nothing hidden beneath the surface of a story. ”