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What does MEST stand for in Scientology?

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In Scientology, the acronym MEST stands for matter, energy, space, and time.1

According to the teachings of founder L. Ron Hubbard, the interaction of thetans—the spiritual identity of an individual—led to the creation of the MEST universe, which constitutes the visible physical world. Scientology doctrine posits that thetans eventually became trapped within this MEST universe, losing their original creative abilities and memories due to the influence of engrams.1