Scientologists look for to attain spiritual advancement by means of research of Scientology resources and auditing. The topic (termed Engineering or Tech in Scientology jargon) is structured in the number of levels (or gradients) of gradually growing complexity. When actress Leah Remini publicly still left the Church in 2013, https://www.scientology.de/faq/background-and-basic-principles/what-is-scientology.html