If the would-be mystic is to keep out of these pitfalls he should keep out of spiritualism. He should refuse to engage in any practices which lead directly to mediumistic subjection. If, however, he has already engaged in them, he should renounce them at once and try to bring his mind back to an alert, wakeful, and active condition. He should seek with the true mystic the highest degree of self-control rather than with the spiritistic medium the lowest degree of self-submission.
-- Notebooks Category 16: The Sensitives > Chapter 13: The Occult > # 150