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There are three factors concerned in mediumship: (1) the spirit controlling; (2) the mental atmosphere of the medium controlled; and (3) the mental atmosphere of the people surrounding the medium. And as A. Morton has said:
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The requirements for honesty on the part of mediums are equally binding upon investigators; they must have honesty of purpose if they expect to attract honest spirits.
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Although the spirits may be intensely anxious to demonstrate their power, they are sometimes repelled from those whom they seek to approach by the bristling and discordant conditions of mind that prevail among the sitters, who disperse with a feeling of dissatisfaction and disappointment. If the sitters only knew it, the so-called failure was directly traceable to the destructive thought-atmosphere with which they surround themselves and the medium. Too frequently they do not prepare themselves for 'the hour's communion with the dead,' and their mental attitude is anything but conductive to success. They do not put away the thronging thoughts, anxieties, and worries of their busy lives, but carry them right into the seance chamber, yet expect good spiritual results. Both sitter and medium may very easily destroy the indispensable conditions of spirit-manifestation, and the medium's honesty, not his want of growth, or of knowledge, is called in question by the investigator who knows, and perhaps cares, nothing for the occult laws he has violated, not obeyed.