From September 1955 edition book changed several terms in the original edition, to keep with "Dianetics: The Modern Science of Mental Health" terminology. For example, the word "norn" changed to "engram". In Norse Mythology, Norn was name for goddesses of Fate: Skuld (the Future), Verdaude (the Present) and Urd (the Past). They controlled Man's destiny and made him follow a course of conduct nolens volens.