Fakhr al-Dīn al-Rāzī was a Persian universal scholar and theologian, particularly well-known for his tafsīr or work of Qur'ānic interpretation, a mainstay of Sunni Islam to this day. Less well-known is his work of addressative, astral, talismanic ritual, The Hidden Secret. Michael Noble has published a study of this work in the context of Rāzī's thought and of the larger intellectual currents in which he swam. Come for the enduring legacy of staunch, but philosophically-rich, Sunni theology, stay for the orgies and severed heads.