A history of science and magic spanning the period from early Christianity, through early modern Europe, to the end of the 17th century.

Vols. 1-2 concern the first 13 centuries of the Christian era; vols. 3-4, the 14th and 15th centuries, vols. 5-6, the 16th century, and vols. 7-8, the 17th century.

Volume Three of Ernest Fortin: Collected Essays discusses the current state of Christianity—especially twentieth-century Catholic Christianity—and the problems with which it has had to wrestle in the midst of rapid scientific progress, profound social change, and growing moral anarchy. In this volume, Fortin discusses such topics as Christianity and the liberal democratic ethos; Christianity, science, and the arts; Ancients and Moderns; papal social thought; virtue and liberalism; pagan and Christian virtue; and the American Catholic church and politics.

Gnosis traces the use of powerful gnostic visionary techniques from Hellenistic Gnosticism and Jewish merkabah mysticism, through Muhammad, the Ismaeilis, and theosophical Sufism to medieval neoplatonism, and renaissance alchemy.