It chronicles the mystical journey of the author as he explored the 30 Enochian aethyrs originally developed by John Dee and Edward Kelley in the 16th century.

These visions took place at two times: in 1900 during his stay in Mexico, and later in 1909 in Algeria in the company of poet Victor Benjamin Neuburg.

The Vision and the Voice is the source of many of the central spiritual doctrines of Thelema, especially in the visions of Babalon and her consort Chaos (the "All-Father"), as well as an account of how an individual might cross the Abyss, thereby assuming the title of "Master of the Temple" and taking a place in the City of the Pyramids under the Night of Pan.

The source manuscript (in five numbered notebooks) can be viewed at Harry Ransom Center collection in Austin, Texas.

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