What many people don't realize, even those who may be planning to attend classes at the Kabbalah Center with Rav Berg or any of the other teachers, is that the Kabbalah dates back hundreds of years. The primary - both in chronology and in importance - texts of the Kabbalah date back by around 1800 years!
The Zohar is the primary text, an it was apparently written sometime before 200 A.D.! The amazing thing is that there are people like Rav Berg and Karen Berg and others who understand the Kabbalah texts, and they even explain and teach them to others who lack the skills and knowlege they have.
The Kabbalah Centre's many courses offer us a chance to gain a glimpse of the texts that underlie the teachings of the Kabbalah Center.