Vintage Grant Morrison in an interview with A. David Lewis at PWCW:
GM: Yeah! Because it’s the obvious, isn’t it? Again, this isn’t a mystical concept, because I’m not a mystical person sometimes. I got into magic to see if it was real. If someone says, “Ok, a demon will appear if you do this spell,” I just say, “Bullshit.” So, I did this spell, and then the demon appeared. So I had to revise my vision of what the world was and how it worked. Again, that’s another element of magic for me, trying to figure out, why do these things happen—what are we doing to our nervous systems to make us believe a demon has entered the room? It became to me about the actual “nuts and bolts” of it, not the fantastic thing or the mystic thing or the names of angels. I became interested in what’s actually going on.
PWCW: But you tried it out, and a demon did appear?