Franz Rottensteiner said this quote

Nevertheless, the potential and actual importance of fantastic literature lies in such psychic links: what appears to be the result of an overweening imagination, boldly and arbitrarily defying the laws of time, space and ordered causality, is closely connected with, and structured by, the categories of the subconscious, the inner impulses of man's nature. At first glance the scope of fantastic literature, free as it is from the restrictions of natural law, appears to be unlimited. A closer look, however, will show that a few dominant themes and motifs constantly recur: deals with the Devil; returns from the grave for revenge or atonement; invisible creatures; vampires; werewolves; golems; animated puppets or automatons; witchcraft and sorcery; human organs operating as separate entities, and so on. Fantastic literature is a kind of fiction that always leads us back to ourselves, however exotic the presentation; and the objects and events, however bizarre they seem, are simply externalizations of inner psychic states. This may often be mere mummery, but on occasion it seems to touch the heart in its inmost depths and become great literature.

~ Franz Rottensteiner

As has already been noted, fantastic literature developed at precisely the moment when genuine belief in the supernatural was on the wane, and when the sources provided by folklore could safely be used as literary material. It is almost a necessity, for the writer as well as for the reader of fantastic literature, that he or she should not believe in the literal truth of the beings and objects described, although the preferred mode of literary expression is a naive realism. Authors of fantastic literature are, with a few exceptions, not out to convert, but to set down a narrative story endowed with the consistency and conviction of inner reality only during the time of the reading: a game, sometimes a highly serious game, with anxiety and fright, horror and terror.

~ Franz Rottensteiner

Many of the best fantastic stories begin in a leisurely way, set in commonplace surroundings, with exact, meticulous descriptions of an ordinary background, much as in a 'realistic' tale. Then a gradual - or it may be sometimes a shockingly abrupt - change becomes apparent, and the reader begins to realize that what is being described is alien to the world he is accustomed to, that something strange has crept or leapt into it. This strangeness changes the world permanently and fundamentally.

~ Franz Rottensteiner

The fantastic postulates that there are forces in the outside world, and in our own natures, which we can neither know nor control, and these forces may even constitute the essence of our existence, beneath the comforting rational surface. The fantastic is, moreover, a product of human imagination, perhaps even an excess of imagination. It arises when laws thought to be absolute are transcended, in the borderland between life and death, the animate and the inanimate, the self and the world; it arises when the real turns into the unreal, and the solid presence into vision, dream or hallucination. The fantastic is the unexpected occurrence, the startling novelty which goes contrary to all our expectations of what is possible. The ego multiplies and splits, time and space are distorted.

~ Franz Rottensteiner