“The living church retiring gradually within the lonely sanctuary of a few solitary hearts, an external church was substituted in its place, and all its forms were declared to be of divine appointment. Salvation no longer flowing from the Word, which was henceforward put out of sight, the priests affirmed that it was conveyed by means of the forms they had themselves invented, and that no one could obtain it but by these channels.... The doctrine of the church and the necessity of its visible unity, which had begun to gain ground in the third century, favored the pretensions of Rome.” D’Aubigne’s History of the Reformation, Book I, Chap. 1.
“At the end of the third century almost half the inhabitants of the Roman empire, and of several neighboring countries, professed the faith of Christ. About this time endeavors to preserve a unity of belief, and of church discipline, occasioned numberless disputes among those of different opinions, and led to the establishment of an ecclesiastical tyranny.” Encyclopaedia of Religious Knowledge.
Concerning the Roman diocese, the Encyclopaedia Britannica says, “Before the termination of the third century the office was held to be of such importance that its succession was a matter of interest to ecclesiastics living in distant sees.” Vol. XIX, p. 488.
“Almost proportionate with the extension of Christianity was the decrease in the church of vital piety. A philosophizing spirit among the higher, and a wild monkish superstition among the lower orders, fast took the place in the third century of the faith and humility of the first Christians. Many of the clergy became very corrupt, and excessively ambitious. In consequence of this there was an awful defection of Christianity.” Marsh’s Church History, p. 185.