Dianetics

L. Ron Hubbard's 1950 self-help text — claiming that mental health issues derive from 'engrams' (traumatic memory traces) that can be cleared through 'auditing' — which launched Scientology and remains the foundational text of the movement.

Creates the auditing framework — Dianetics's theory (that the 'reactive mind' stores engrams that create neurosis, and that these can be cleared through auditing — guided memory recall) gave Scientology its therapeutic entry point and its pseudo-scientific vocabulary.