The claim by both hypnotism and spiritualism that one human mind is capable, under certain conditions, of entering another human mind is true enough. It is also capable of dominating the other one. These two possibilities exist mostly in those situations where a person has willingly thrown himself open to another person's influence, has sat in the hypnotist's chair or at the spiritist's table. They also exist outside of these situations, particularly if someone sits for meditation by trying to make his mind a blank, without previously trying also over a sufficient period to purify his character, uplift his motives, and achieve some balance between his emotions and reason.
-- Notebooks Category 16: The Sensitives > Chapter 13: The Occult > # 107