The Augsburg Confession and the Apology of the Augsburg Confession are the fundamental confessions of faith contained in the Book of Concord. The Apology is also the longest and most detailed of the Lutheran Confessions. Never before has an edition been published where both were available. In addition, this edition features three other works in the appendix to help make sense of the writings in these fundamental books: Martin Luther's "Exhortation to the Clergy in Augsburg (1530)", John Eck's "404 Theses", and the Roman Catholic's response to the Augsburg Confessions, "Confutation of the Augsburg Confession."