The work opens by establishing the author's methodological approach, opting for a deeply documented analysis of specific aspects of witchcraft rather than a superficial global survey. The text immediately confronts the reality of the witch-cult, arguing against nineteenth-century rationalist skepticism and dismissing theories that view witchcraft merely as folklore, poetry, or psychological delusion. Instead, Montague Summers maintains that witchcraft was a genuine historical and social factor rooted in the diabolic heresies of earlier epochs, most notably Manichaeism and Gnosticism.
The historical continuity of the dark arts is traced from classical antiquity through the early centuries of Christianity and the Middle Ages. The author demonstrates that ecclesiastical and civil legislation against sorcerers was not an invention of the medieval Church, but a continuation of ancient Roman edicts against goetic theurgy and public subversion. Special emphasis is placed upon the ideological link between heresy and witchcraft, asserting that the weed of heresy grew alongside the weed of witchcraft, both representing an organized revolt against divine and social order.
A central portion of the volume examines the nature of the witch's worship, detailing the formal pact with Satan, the renunciation of the Christian faith, the desecration of sacraments, and the adoption of new names and marks. The author analyzes the theology of fallen angels, the reality of diabolical pacts signed in human blood, and the historical existence of the Devil's mark and localized animal familiars. Particular attention is given to the phenomena of incubi and succubi, supported by an extensive catena of authorities from scholastic theologians to modern moralists.
The rituals of the Sabbat are meticulously reconstructed from contemporary trial transcripts and inquisitorial reports. The book details the organization of covens, the parody of the Catholic Mass, the raising of tempests, and the offering of sacrifices. Throughout these chapters, the author insists upon the literal interpretation of the confessions, arguing that physical anesthesia, levitation, and supernatural manifestations cannot be dismissed as mere hysteria or auto-suggestion.
The volume concludes with an examination of witchcraft as mirrored in dramatic literature, focusing primarily upon the English Renaissance theatre. By analyzing contemporary plays that touch upon sorcery, the author illustrates how closely the playwrights mirrored the manners and fears of their age. The overarching argument remains steadfast: witchcraft was a formidable, malevolent organization of secret conspirators inimical to both Church and State.
