"I’m convinced that deception is the key to understanding the entire phenomenon.  At every level, we are deceived and so we (1) do not know where to put our trust  and loyalty, if anywhere, and (2) do not know what actions we ourselves should take to alter our relations with ETs.  Most of what we see and remember (even in the first level of hypnotic recall) is not “true” or objectively accurate, I believe strongly, so we really do not know what the ETs are doing with us.  And if they deliberately deceive us this way, how on Earth can we trust anything they tell us."
-Dr. Carla Turner- from Unlocking Alien Closets by Leah A. Haley

[UFO] “behavior is more akin to magic than to physics as we know it…the modern UFOnauts and the demons of past days are probably identical… What is quite certain is that the phenomenon is active here on our planet, and active here as master.”

Pierre Guerin, “Thirty Years After Kenneth Arnold,” in Flying Saucer Review, Vol. 25, No. 1, pp. 13,14

“We are dealing with a yet unrecognized level of consciousness, independent of man but closely linked to the earth…I do not believe anymore that UFOs are simply spacecraft of some race of extraterrestrial visitors. This notion is too simplistic to explain their appearance, the frequency of their manifestations throughout recorded history, and the structure of the information exchanged with them during contact.”

“The ‘medical examination’ to which abductees are said to be subjected, often accompanied by sadistic sexual manipulation, is reminiscent of the medieval tales of encounters with demons. It makes no sense in a sophisticated or technical or biological framework: any intelligent being equipped with the scientific marvels that UFOs possess would be in a position to achieve any of these alleged scientific objectives in shorter time with fewer risks”

-Vallee, Confrontations - A Scientist's Search for Alien Contact; pg. 13

“Impressive parallel [can] be made between UFO occupants and the popular conception of demons”
-Vallee: “Messengers of Deception;” pg. 15

[UFO’s Can] “project images or fabricated scenes designed to change our belief systems.”

-Vallee: “Messengers of Deception,” pg. 19

“human belief…is being controlled and conditioned,” man’s concepts are being rearranged,” [and we may be heading for] “a massive change of human attitudes toward paranormal abilities and extraterrestrial life.”

-Vallee: “The Invisible College,” pp. 3, 201, 204.

“I [have] watched in dismay as a number of respected UFO researchers moved from a physical to a parapsychological interpretation of the bizarre UFO phenomenon….now I [too] am being forced to reexamine the UFO phenomenon in light of its apparent paraphysical nature.”
-Raymond E. Fowler: “The Watchers: The Secret Design Behind UFO Abduction;” (New York: Bantam 1991)  pp. xv, 183

“Further, if one sets the three occult groups against the three classifications of UFO entities and their characteristics, it is rather surprising how complementary to each other they appear to be, not only through their appearance, activities, and level of behavior, but also in the quality of mental and especially, emotional reaction and response that has been noted to have occurred on contact”

-Ivar Mackay: “UFO Entities: Occult and Physical,” in Flying Saucer Review, Vol. 16 Nos. 4 & 5

“A large part of the available UFO literature is closely linked with mysticism and the metaphysical. It deals with subjects like mental telepathy, automatic writing and invisible entities as well as phenomena like poltergeist (ghost) manifestations and “possession.” Many of the UFO reports now being published in the popular press recount alleged incidents that are strikingly similar to demonic possession and psychic phenomena…” 

-Lynn Catoe, “UFO’s and Related Subjects: An Annotated Bibliography.” 1969 US Government Printing Office. (Prepared under Air Force Office of Scientific Research ; Project Order 67-0002 and 68-0003)

John Keel observes, after studying literature on demonology that: “The manifestations and occurrences described in this imposing literature are similar if not entirely identical to the UFO phenomenon itself.”

-John Keel: “UFO’s: Operation Trojan Horse (New York, Putnam’s, 1970) pg. 215

“The UFO manifestations seem to be, by and large, merely minor variations of the age-old demonological phenomenon.”

-John Keel: “UFO’s: Operation Trojan Horse; (New York, Putnam’s, 1970) pg 299

“A working knowledge of occult science…is indispensable to UFO investigation.”

Trevor James: “The Case For Contact – Part Two,” in Flying Saucer Review, Vol. 8, No. 1, pg. 10

“Studies of flying saucer cults repeatedly show that they are part of a larger occult social world.”

David Stupple and William McNeece, “Contactees, Cults and Culture,” in 1979 MUFON UFO Symposium Proceedings, pg. 49

“Increasingly I felt as if I were entering a struggle that might even be more than life-or-death. It might be a struggle for my soul, my essence, or whatever part of me that might have reference to the eternal. There are things worse than death, I suspected…So far the word demon had never been spoken among the scientists and doctors who were working with me…Alone at night I worried about the legendary cunning of demons…At very least, I was going stark, raving mad.”

-Whitley Strieber: “Transformation,” pg 96

"I wondered if I might not be in the grip of demons, if they were not making me suffer for their own purposes, or simply for their enjoyment."
-Whitley Strieber, Transformation, p.172