"My feelings are that science fiction, with its rational, quasi-documentable approach to existence, springs from the well-lighted, well-regulated areas of our private universes, whereas fantasy, in the tradition of its historical origins, has its roots in the dark areas. Somewhere, I already hear voices raised in objection to my implication that fantasy springs from ignorance and science fiction from enlightenment. In a way it is true, and in a way it is not."