Editing Ceremonial magic (section)

===Aleister Crowley===
{{further|Aleister Crowley|Aleister Crowley bibliography}}
English author and occultist Aleister Crowley (1875–1947) wrote about magical practices and theory, including those of ''[[theurgy]]'' ("high magic") and ''[[goetia]]'' ("low magic"). In ''[[The Book of the Law]]'' and ''[[The Vision and the Voice]]'', the Aramaic magical formula ''[[Abracadabra]]'' was changed to ''[[Abrahadabra]]'', which he called the new formula of the [[Aeon (Thelema)|Aeon of Horus]]. He also famously spelled magic in the archaic manner, as 'magick', to differentiate "the true science of the Magi from all its counterfeits."{{sfnp|Crowley|1997|p=47}} He also stated that "The spirits of the Goetia are portions of the human brain."{{sfnp|Crowley|2008|p=17}}

His book ''[[Magick (Book 4)|Magick, Liber ABA, Book 4]]'', is a lengthy treatise on magic in which he which also presents his own system of Western [[occult]] practice, synthesised from many sources, including [[Yoga]], [[Hermeticism]], medieval [[grimoires]], contemporary magical theories from writers like [[Eliphas Levi]] and [[Helena Blavatsky]], and his own original contributions. It consists of four parts: Mysticism, Magick (Elementary Theory), Magick in Theory and Practice, and ΘΕΛΗΜΑ—the Law (The Equinox of The Gods). It also includes numerous appendices presenting many rituals and explicatory papers.{{citation needed|date=December 2021}}

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