Another cause was found in the philosophy which arose. The years following the general declaration of peace, while the public attention was directed to the political reforms which were consummated in the Reform act, were marked by the thorough investigation of the first principles of every branch of knowledge. Two minds of that period have, more than any other, affected the succeeding generation; the one a utilitarian philosopher, the other an intuitional. Both alike carried out the system which Descartes and Bacon had inaugurated, of finding the standard of truth in the analysis of the powers of the human understanding. But Bentham criticised to destroy the past; Coleridge to rebuild it. The one asked, Is a doctrine true? The other asked, what men had meant by it who had thought it so?(900) The one overlooked the truth previously known; the other too boldly strove to rebuild it from his own consciousness, after surrendering the old proofs of it. The one, with the practical spirit of the Englishman, looked upon an opposing opinion only as an object suited for attack; the other, with a spirit caught from Germany, felt that there was some truth everywhere latent. But both were reformers; both stimulated the revolt against the cold spirit of the last century; both contributed to create, the one indirectly, the other intentionally, a subjective spirit by their psychological analysis. Even movements which at first sight seem most alien to this spirit in character, have really been affected unconsciously by it.(901) The ecclesiastical reaction which sprang up about a quarter of a century ago, though seemingly most objective in its nature, witnessed not less than the very opposite, or rationalistic tendency, to the presence of this influence. For both alike were founded on the idea that religion lacked a philosophical groundwork: both sought a new ground of faith different from that of the last century; the one in those utterances of consciousness which created a reverence for historic tradition; the other in those intuitions which were supposed to rise above scripture and tradition, and to form the basis and measure of both. The causes just named in literature and philosophy respectively, are some of those which have contributed to create or to foster the change in the character of the literature, and in the spirit of the age, which has produced the alteration of tone which exists in the modern sceptical literature. In passing from these remarks on the peculiarly subjective tone of modern unbelief, and the literary influences which have produced the general change in the public taste, of which it is only one example, to an enumeration of the authors who have given expression to doubt, and of the specific forms of doubt now existing, we encounter a difficulty of classification.