We have dwelt long on Shelley, as a most instructive example for observing the various influences, personal and social, intellectual and moral, philosophical and political, combining to form unbelief. His thoughts are the last echo of the unbelief of the last century. The great movement of Germany has completely changed the scepticism of the present. The instances that we have found of unbelief in England were indications of a tendency rather than a movement. They were however of sufficient importance to call forth the voices of the church in reply or in protest. It has been remarked, that in the former half of the eighteenth century the attack was chiefly directed against the internal doctrines and narratives of revelation, on the assumption that they clashed with the judgment of common sense, or of the moral faculty. And therefore the writers on the evidences, adapting their defence to the attack, employed themselves chiefly in establishing the internal evidences, the moral need of a revelation generally, and the suitability of the Christian in particular, before producing the divine testimony which authenticates it. But about the middle of this century the historic spirit arose, and the point of attack shifted to an assault on the historic value of the literature which contains the revelation. The question thenceforth became a literary one, whether there was documentary proof that a revelation had been given. The defence accordingly ceased to be philosophical, and became historical.(649)