In the opening section of “A Treatise on Good Works,” Martin Luther declares: “The first and highest, the most precious of all good works is faith in Jesus Christ.”1 Luther was not an ethicist as such, but his claim, if true, has wide-ranging implications for anyone in pursuit of the “good life”—that end toward which ethics is aimed. Such a bold idea warrants justification. What could this statement possibly mean? How is faith a work