"A lady, hoping to develop herself spiritually had allowed herself to become passively mediumistic, and her health began to fail.
"On one occasion, feeling very weak, she asked me to mesmerise her. I availed myself of this opportunity, and while apparently only making mesmeric passes over her I occultly surrounded her with a protective aura as in my own case. The result was successful, she improved in strength, and, as a well-known student of occultism observed to me, she looked more human; and with all this, her mediumistic experiences ceased. Had she followed my advice, and held herself positive; I believe she would have fully recovered her health and strength; but she again drifted back into her former condition of passive mediumship, her health broke down, and after a lingering illness, she died."
— Flying Roll V, Some Thoughts on Imagination (Berridge)
"It will be seen upon consideration that every thought which is creative and positive (as distinct from a passive and mediumistic reflex) must contain, as it were, within itself the complement and completion thereof, i.e. Intuition."
— Flying Roll XXVII, The Principia of Theurgia or the Higher Magic (Bullock)
"In using Symbols it is necessary to avoid self hypnotisation, for this occurrence would dispose you to mediumship, and to be the playground of forces you must control, and not permit to control you."
— Flying Roll XI, Clairvoyance (Mathers)
"He or she who is operating should avoid carefully any self hypnotisation by the Tattva, for this will simply lead to foolish and hysteric visions, the offspring of the intoxication of the Operator’s astral sphere by the Tattva."
— Flying Roll XXX, Tattwas and Skrying and Hierophant’s Making 0=0 Signs (Mathers)
"So long as you lead an ordinary life you are safe from the assaults of influences beyond the material world of your brother men; but as soon as you get outside of that world and put yourself in a position to seek out occult mysteries, you bring yourself under the action of forces of which you know very little or nothing. The only way to avoid being controlled by such forces, to which you have rendered yourself liable, is to preserve what we call the positive attitude, which is the extreme contrast to what is called mediumship. A medium is one who cultivates negativity and such a person is therefore one to be avoided. The condition we want you to cultivate is that of positivity. I could give you a very good example of a person who is negative and who has got into trouble almost entirely through that."
— Flying Roll IXI, The Aims and Means of Adeptship (Westcott)
"Regarding seers and mediums, as before remarked, our school lays great stress on the simultaneous development of, crudely speaking, the three planes of being, which development must precede psychic experiment. The methods employed to equilibrate the nature entail considerable study, time and patience. There is no royal road to any science, let alone the science of the occult. Before touching such experiments as obtain in spiritualism, the student would be supposed to be in a measure aware of the nature of the entities he would be likely to encounter, and especially to have some idea of the constitution of Man. When this is achieved he will be equipped and enabled to face the many dangers and difficulties he will encounter in the invisible world.
"Spiritualism is distinctly a Western movement and has certainly been the means of bringing conviction of the after life to many. The methods employed by spiritualists may be very dangerous, in that they frequently lack the preliminary preparation and knowledge necessary before approaching psychic phenomena. The spiritualist who lacks this specialized knowledge must be prepared to encounter all the dangers which explorers in unknown lands are beset. He who enters into these regions has sometimes found it easier to open the door than to close it."
— Moina Mathers, Introduction to The Kabbalah Unveiled (July, 1926)
"And this is the reason why there are so many and multifarious errors in untrained spirit visions. For the untrained seer, even supposing him free from the delusions of obsession, doth not know or understand how to unite his consciousnesses and the harmonies between his own sphere of sensation, and the universe, the Macrocosmos. Therefore is it so necessary that the Adeptus Minor should correctly understand the principia and axiomata of our secret knowledge, which are contained in our Rituals and Lectures."
"Inspiration (passive and in some cases mediumistic, thus differing from that of the Hierophant and Magician and Hermit.)"