Book excerpt: Perhaps no work of Martin Luther's so captures the revolutionary zeal and theological boldness of his vision as The Freedom of a Christian. Yet, it is not easily accessible today. Mark Tranvik's new translation of Luther's treatise brings alive the social, historical, and ecclesial context of Luther's treatise. This is the first of a set of student guides to key Reformation treatises by Martin Luther, concentrating on those most widely used in college settings.