Formula of Concord
In reply to Rudolf Hospinian's "Concordia discors" (1607), he wrote a work, rich in historical material but one-sided in its argument, "Concordia concors" (1614), defending the formula of Concord, which he regarded as inspired. His "Irenicum vere christianum" is directed against David Pareus (1548–1622), professor primarius at Heidelberg, who in "Irenicum sive de unione et synodo Evangelicorum" (1614) had pleaded for a reconciliation of Lutheranism and Calvinism; his "Calvinista aulico-politicus" (1610) was written against the "damnable Calvinism" which was becoming prevalent in Holstein and Brandenburg. Another work, based on the Formula of Concord, was entitled "Loci communes theologici".