the dogmatic principle: they are not that principle themselves; they presuppose the principle; they are summoned into action at the call of the principle, and the principle might act even before they had their legitimate place, and exercised a recognized power, in the movements of the Christian body. 5. The instance of Conscience, which has already served us in illustration, may assist us here. What Conscience is in the history of an individual mind, such was the dogmatic principle in the history of Christianity. Both in the one case and the other, there is the gradual formation of a directing power out of a principle. The natural voice of Conscience is far more imperative in testifying and enforcing a rule of duty, than successful in determining that duty in particular cases. It acts as a messenger from above, and says that there is a right and a wrong, and that the right must be followed; but it is variously, and therefore erroneously, trained in the instance of various persons. It mistakes error for truth; and yet we believe that on the whole, and even in those cases where it is ill-instructed, if its voice be diligently obeyed, it will gradually be cleared, simplified, and perfected, so that minds, starting differently will, if honest, in course of time converge to one and the same truth. I do not hereby imply that there is indistinctness so great as this in the theology of the first centuries; but so far is plain, that the early Church and Fathers exercised far more a ruler's than a doctor's office: it was the age of Martyrs, of acting not of thinking. Doctors succeeded Martyrs, as light and peace of conscience follow upon obedience to it; yet, even before the Church had grown into the full measure of its doctrines, it was rooted in its principles. 6. So far, however, may be granted to M. Guizot, that even principles were not so well understood and so carefully handled at first, as they were afterwards. In the early period, we see traces of a conflict, as well as of a variety, in theological elements, which were in course of combination, but which required adjustment and management before they could be used with precision as one. In a thousand instances of a minor character, the statements of the early Fathers are but tokens of the multiplicity of openings which the mind of the Church was making into the treasure-house of Truth; real openings, but incomplete or irregular. Nay, the doctrines even of the heretical bodies are indices and anticipations of the mind of the Church. As the first step in settling a question of doctrine is to raise and debate it, so heresies in every age may be taken as the measure of the existing state of thought in the Church, and of the movement of her theology; they determine in what way the current is setting, and the rate at which it flows. 7.