Edward Fisher's "The Marrow of Modern Divinity" is written as a dialogue that draws upon the insights of Martin Luther, John Calvin, and other notable 16th and 17th century Protestants to distinguish the law from the gospel and to confront the errors of antinomianism and legalism. While these issues are of perennial relevance for Christ's church, the antiquity, intricacy, and format of Fisher's book can make it daunting for contemporary readers. In...