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The cult will always have some sacred doctrine. It may be the Christian bible, the Koran, or some recently revealed document.
This book will have been revealed to the originator and or other subordinate leaders by mystic and miraculous means. Visitation by angles and other deified beings is not an uncommon happening to give weight to the claim of divine authorship of the documents.
This inscribed sacred doctrine is then repeated over and over again until it is permanently imbedded in the permanent storage section of the brain.