“And then he pursed his lips in disgust. “Doubtless that was the result of supernatural interference with our brains! How I hate the supernatural!””

Of course, after his death, his disciples tend to deify him or at least give him saintly status.
Man's Rise to Civilization (1968)

[2003, Survey of Metaphysics and Esoterism, World Wisdom, 141, 978-0-94153227-3]
Human being, Specificities

Myth and Reality (1963)
Context: Myth is an extremely complex cultural reality, which can be approached and interpreted from various and complementary viewpoints.
Speaking for myself, the definition that seems least inadequate because most embracing is this: Myth narrates a sacred history; it relates an event that took place in primordial Time, the fabled time of the "beginnings." In other words myth tells how, through the deeds of Supernatural Beings, a reality came into existence, be it the whole of reality, the Cosmos, or only a fragment of reality — an island, a species of plant, a particular kind of human behavior, an institution. Myth, then, is always an account of a "creation"; it relates how something was produced, began to be. Myth tells only of that which really happened, which manifested itself completely. The actors in myths are Supernatural Beings. They are known primarily by what they did in the transcendent times of the "beginnings." hence myths disclose their creative activity and reveal the sacredness (or simply the "supernaturalness") of their works. In short, myths describe the various and sometimes dramatic breakthroughs of the sacred (or the "supernatural") into the World. It is this sudden breakthrough of the sacred that really establishes the World and makes it what it is today. Furthermore, it is as a result of the intervention of Supernatural Beings that man himself is what he is today, a mortal, sexed, and cultural being.

Before showing test footage from the movie The Lost World, based upon his novel, as a trick at the annual meeting of the Society of American Magicians in 1922. The New York Times ran a story the next day: DINOSAURS CAVORT IN FILM FOR DOYLE SPIRITIST MYSTIFIES WORLD-FAMED MAGICIANS WITH PICTURES OF PREHISTORIC BEASTS — KEEPS ORIGIN A SECRET — MONSTERS OF OTHER AGES SHOWN, SOME FIGHTING, SOME AT PLAY, IN THEIR NATIVE JUNGLES
Context: These pictures are not occult, but they are psychic because everything that emanates from the human spirit or human brain is psychic. It is not supernatural; nothing is. It is preternatural in the sense that it is not known to our ordinary senses. It is the effect of the joining on the one hand of imagination, and on the other hand of some power of materialization. The imagination, I may say, comes from me — the materializing power from elsewhere.

Wells testimony, Kansas evolution hearings http://www.talkorigins.org/faqs/kansas/kangaroo2.html#p681, 2005.

Apocalypse Descending (2002)
Context: Mars Hill was inspired by a real place near where I live on the coast of Maine, a 100+ year old Spiritualist community called Temple Heights: little carpenter's gothic cottages tumbling down a hillside overlooking the sea, very picturesque and, tragically, very susceptible to the terrible development pressure that's bearing down on the small towns around here.
So far, however, the spiritualists seem to be winning out. After I wrote "Last Summer at Mars Hill", I visited the place formally and had a reading done by a psychic there. The place was exactly as I'd imagined it, as were its (human) inhabitants. I saw no evidence of supernatural ones, alas.

When asked, "In your estimation, what does the supernatural genre tell us about ourselves as human beings?" in "He Is Legend" interview at <!-- OBSOLETE DEAD LINK --> Cinemaspy (2007); also quoted in [http://www.npr.org/blogs/thetwo-way/2013/06/24/195317782/author-richard-matheson-i-am-legend-writer-dies-at-87 "Author Richard Matheson, 'I Am Legend' Writer, Dies At 87" at NPR (26 June 2013) http://www.cinemaspy.com/spotlight/interviews/
Context: I think we’re yearning for something beyond the every day. And I will tell you that I don’t believe in the “supernatural,” I believe in the “supernormal.” To me there is nothing that goes against nature. If it seems incomprehensible, it’s because we haven’t been able to understand it yet.

Source: Dictionary of Burning Words of Brilliant Writers (1895), P. 35.

Source: Faith vs. Fact (2015), p. 92