Over the course of thirty years, Hermann Samuel Reimarus (1694-1768) secretly drafted what would become the most thorough attack on revelation to date, ushering the quest for the historical Jesus and foreshadowing the religious criticism of the new atheism of the twentieth century. Peeling away the layers of Reimarus’s radical work by looking at hitherto unpublished manuscript evidence, Ulrich Groetsch shows that the Radical Enlightenment was more than just an international philosophical movement. By demonstrating the importance philology, antiquarianism, and Semitic languages played in Reimarus’s upbringing, scholarship, and teaching, this new study provides a vivid portrayal of an Enlightenment radical at the cusp of the secular age, whose debt to earlier traditions of scholarship remains undisputed.