THE MEDIUMS’ BOOK
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188. Varieties common to all Kinds of Mediumship.
Sensitive Mediums. Persons susceptible to the presence of spirits by a general or local, a vague or material impression. Most of them distinguish the spirits, good or bad, by the nature of the impression.
"Delicate and very sensitive mediums should abstain from communications with violent spirits, or those whose impression is painful, because of the fatigue resulting from it."
Natural or Unconscious Mediums. Those who pro- duce the phenomena spontaneously/without any participation of their will, and often against it. (No. 161.)
Optional or Voluntary Mediums. Those who have the power of inducing the phenomena by an act of their will. (No. 160.) '
" Whatever may be this will, they could do nothing should the spirits refuse, which proves the intervention of a foreign power."