Solid Declaration of the Formula of Concord
Formula of Concord (1577) is an authoritative Lutheran statement of faith (called a confession, creed, or "symbol") that, in its two parts (Epitome and Solid Declaration), makes up the final section of the Lutheran Corpus Doctrinae or Body of Doctrine, known as the Book of Concord. The Solid Declaration [is] a detailed exposition [of the Formula's twelve articles]. (Introduction by Wikipedia)