Yes, one can be certain that initial "high" is the crack cocaine phase of The Work, engineered right into it. That is always going to wear off, they all use those methods, Landmark, Scientology...
Also, as mentioned, one cannot compare Dr. David Burns, to a person like Byron Katie. He is a medical doctor, who was around for years when CBT was being researched, and he has been a part
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"Cults," Sects, and "New Religious Movements"