This is the story of the most significant devotional author of the seventeenth century in his first full English language biography. Using previously unknown letters as a few of the resources, this story aims to recreate the theological, sometimes magical, and social worlds of Johann Arndt. Arndt was regarded by his peers and successive generations as either the most significant Reformer since Luther, or an uneducated and dangerous element within the Lutheran church. Later commentators have given Arndt the credit, or blame, for the founding of the Pietist movement. Arndt was a central figure...