In this extensive theological overview, the chief author of the Formula of Concord provides a commentary on Philip Melanchthon's Loci Communes. Drawing on Lutheran tradition and interacting with many of the early church fathers, in Part II and III Chemnitz addresses the topics of the divine Law, including a detailed exposition of the Decalog, natural law, and the use of the Law, justification and the Gospel, including detailed studies of the words "faith" and "gace", good works, including the necessity of such works, the difference between the old and new covenants, and between mortal and venial sin, the church, and the sacraments in general. This volume continues the presentation from Loci Theologici Part I (Chemnitz's Works 7).