With fascinating comments from famed renegade to the status quo, Egyptologist John Anthony West:
The ancient Arabic name for Egypt was "Khemet" or "The Black Land". The western continuation of the Egyptian magical arts was called "Al-Khemet" meaning from the Black Land. The cradle of civilization is also the ancestral home of a Forbidden Knowledge of magic. We explore the many modern incarnations of the ancient science of perfection and the transformation of the "materia prima" of the Alchemists. From Alchemy to Tarot, and in the many modern\par esoteric and mystical societies existing today, we explore the hidden thread that connects modern and ancient magic. The occult idea that consciousness is the "materia prima". The coal that turns into a diamond. The lead that becomes gold.
Forbidden knowledge, which is different from secret knowledge, is used to describe forbidden books or other information to which access is restricted or deprecated for political or religious reasons. Forbidden knowledge is commonly not secret, rather a society or various institutions will use repressive mechanisms to either completely prevent the publication of information they find objectionable or dangerous (censorship), or failing that, to try to reduce the public's trust in such information (propaganda). Public repression can create paradoxical situation where the proscribed information is generally common knowledge but publicly citing it is disallowed.