This section is from the book "Practical Lessons In Hypnotism", by Wm. Wesley Cook. Also available from Amazon: Practical Lessons In Hypnotism.
It must be admitted that the mind may be injured by making positive hypnotic suggestions of insanity. It is unwise, to say the least, to cause a subject to consider himself insane. Such an impression, if long continued, might make a deep impression upon the mind and result disastrously unless relieved by a counter-suggestion, such as: "Now, you are perfectly sane again, your mind is all right."
To frequently suggest to a subject that he is a maniac, and allow him to persist in acting in accordance with such a suggestion, may render him extremely liable to become easily angered or mentally disturbed.
It is well to be careful in suggesting to a subject on exhibition that he is a thief or a drunkard and allow him to act the part. Of course, the suggestion will not make him either in his everyday life, but if he should become such, his friends and relatives would probably blame the operator. In a small com-munitv this would be very unnleasant, although most uncalled for and unjust. Relief from the suggestion always destroys the possibility of after effects, but this fact is not generally known.
 
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