The development of the system of Christian doctrine must become a necessity when Christianity meeting with pagan culture in the form of science is called upon to defend her claim to be the universal religion. In the first three centuries, however, there was as yet no official construction and establishment of ecclesiastical doctrine. There must first be a certain measure of free subjective development and wrestling with antagonistic views. A universally acknowledged organ is wanting, such as that subsequently found in the Œcumenical Councils. The persecutions allowed no time and peace for this; and the church had enough to do in maintaining what is specifically Christian in opposition to the intrusion of such anti-Christian, Jewish and Pagan elements as sought to gain a footing in Ebionism and Gnosticism. On the other hand, friction and controversy within the church had already begun as a preparation for the construction of the ecclesiastical system of doctrine. The _Trinitarian_ controversy was by far the most important, while the _Chiliastic_ discussions were of significance for Eschatology. § 33.1. =The Trinitarian Questions.=--The discussion was mainly about the relation of the divine μοναρχία (the unity of God) to the οἰκονομία (the Trinitarian being and movement of God). Then the relation of the Son or Logos to the Father came decidedly to the front. From the time when the more exact determination of this relationship came to be discussed, toward the end of the 2nd cent., the most eminent teachers of the Catholic church maintained stoutly the personal independence of the Logos--=Hypostasianism=. But the necessity for keeping this view in harmony with the monotheistic doctrine of Christianity led to many errors and vacillations. Adopting Philo’s distinction of λόγος ἐνδιάθετος and λόγος προφορικός (§ 10, 1), they for the most part regarded the hypostasizing as conditioned first by the creating of the world and as coming forth not as a necessary and eternal element in the very life of God but as a free and temporal act of the divine will. The proper essence of the Godhead was identified rather with the Father, and all attributes of the Godhead were ascribed to the Son not in a wholly equal measure as to the Father, for the word of Christ: “the Father is greater than I” (John xiv. 28), was applied even to the pre-existent state of Christ. Still greater was the uncertainty regarding the Holy Spirit. The idea of His personality and independence was far less securely established; He was much more decidedly subordinated, and the functions of inspiration and sanctification proper to Him were ascribed to Christ, or He was simply identified with the Son of God. The result, however, of such _subordinationist hypostasianism_ was that, on the one hand, many church teachers laid undue stress on the fundamental anti-pagan doctrine of the