Johann Arndt (1555-1621) is one of the most influential figures in Protestant Christianity. His "Vier Bucher von wahrem Christentum" (Four Books on True Christianity) have been translated into many languages and are among the all-time best-sellers of Christian world literature. This volume collects essays (some heretofore unpublished) on Arndt by Hans Schneider, one of the most important living Arndt scholars.