I have to agree with you that Byron Katie is dangerous. I would have to ask, Would you go to an unlicensed psychiatrist and let them do therapy on you? Would you let them hypnotize you and reprogram your core beliefs? (assuming you have a core belief that you can be hypnotized). She turns you loose to reprogram yourself.
Our core beliefs are what make up who we are. They are given to us partly
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"Cults," Sects, and "New Religious Movements"