The Encyclopedia Britannica, 9th edition, vol. 16, page 774, article "Montanism," says -
"From the middle of the second century a change began to take place in the outward circumstances of Christianity. Should the church take the decisive step into the world? Or ought she, on the other hand to remain as she had been at first, a society of religious devotees, separated and shut out from the world by a rigorous discipline?
"It was natural that warning voices should then be raised in the church against secular tendencies, that the well-known counsels about the imitations of Christ should be held up in their literal strictness before worldly Christians, that demands should be made for a restoration of the old discipline and severity, and for a return to apostolic simplicity and purity.
"The church as a whole, however, decided otherwise. She marched through the open door into the Roman state. With the aid of its philosophy she created her new Christian theology."