This new scholarly edition of Samuel Pufendorf's seminal The Whole Duty of Man According to the Law of Nature is among the first to suggest a purely conventional basis for natural law. Pufendorf wrote this work to make his insights accessible to a wide range of readers, especially university students, who were struggling with issues of church and state. Although indebted to Hobbes and Grotius, the work outlines a new understanding of ethics and politics, one suited to states that were emerging from the aftermath of religious civil war.