Rodney Orpheus has here provided a wide-ranging introduction to liturgical science for 21st-century magicians, as well as collecting valuable traditional and original materials for the purposes of consummating group operations of magick. The Grimoire of Aleister Crowley highlights the aims and innovations of the Great Beast in the field of group ceremony, and includes rituals by Crowley never previously available in book form. It should be valuable to Thelemites both within and outside of formal initiatory societies, and to students of the occult in general.
– T Polyphilus, Ep. Gn.