Scholarship on the German Reformation has long equated preaching with Protestantism, just as many scholars have employed sermons but usually in supplemental and unsystematic ways. Based on an analysis of over 400 standard sermon collections (postils) produced by Catholics, Lutherans, and Calvinists (1520-1620), this study offers the first comprehensive, systematic presentation of these works from a cross-confessional perspective. It lays to rest the notion that preaching was somehow distinctively Protestant while tracing the creation, production, use, and censorship of postils. These sermon collections were nothing less than the applied distillation of Christianity delivered on a regular basis by the clergy to the laity, and as such the most important vehicle for the dissemination of ideas in early modern Germany.