The legitimising of the Rule of Faith by the Communities which were founded by the Apostles; By the "Elders"; By the Bishops of Apostolic Churches (disciples of Apostles); By the Bishops as such, who have received the Apostolic _Charisma veritatis_; Excursus on the conceptions of the Alexandrians; The Bishops as successors of the Apostles; Original idea of the Church as the Holy Community that comes from Heaven and is destined for it; The Church as the empiric Catholic Communion resting on the Law of Faith; Obscurities in the idea of the Church as held by Irenaeus and Tertullian; By Clement and Origen; Transition to the Hierarchical idea of the Church; The Hierarchical idea of the Church: Calixtus and Cyprian; Appendix I. Cyprian's idea of the Church and the actual circumstances; Appendix II. Church and Heresy; Appendix III. Uncertainties regarding the consequences of the new idea of the Church. CHAPTER III.--Continuation.--The Old Christianity and the New Church Introduction; The Original Montanism; The later Montanism as the dregs of the movement and as the product of a compromise; The opposition to the demands of the Montanists by the Catholic Bishops: importance of the victory for the Church; History of penance: the old practice; The laxer practice in the days of Tertullian and Hippolytus; The abolition of the old practice in the days of Cyprian; Significance of the new kind of penance for the idea of the Church; the Church no longer a Communion of Salvation and of Saints, but a condition of Salvation and a Holy Institution and thereby a _corpus permixtum_; After effect of the old idea of the Church in Cyprian; Origen's idea of the Church; Novatian's idea of the Church and of penance, the Church of the Catharists; Conclusion: the Catholic Church as capable of being a support to society and the state; Addenda I. The Priesthood; Addenda II. Sacrifice; Addenda III. Means of Grace. Baptism and the Eucharist; Excursus to Chapters II. and III.--Catholic and Roman. II. FIXING AND GRADUAL HELLENISING OF CHRISTIANITY AS A SYSTEM OF DOCTRINE CHAPTER IV.--Ecclesiastical Christianity and Philosophy; The Apologists 1. Introduction The historical position of the Apologists; Apologists and Gnostics; Nature and importance of the Apologists' theology. 2. Christianity as Philosophy and as Revelation Aristides; Justin; Athenagoras; Miltiades, Melito; Tatian; Pseudo-Justin, Orat. ad Gr.; Theophilus; Pseudo-Justin, de Resurr.; Tertullian and Minucius; Pseudo-Justin, de Monarch.; Results. 3. The doctrines of Christianity as the revealed and rational religion Arrangement; The Monotheistic Cosmology; Theology; Doctrine of the Logos; Doctrine of the World and of Man; Doctrine of Freedom and Morality; Doctrine of Revelation (Proofs from Prophecy); Significance of the History of Jesus; Christology of Justin; Interpretation and Criticism, especially of Justin's doctrines.