The explanation also of the further question concerning the object which the writer proposed to effect, by the treatment of such a subject in a course of Bampton Lectures, is given so fully elsewhere, that a few words may here suffice in reference to it.(20) Experience of the wants of students in this time of doubt and transition, which those who are practically acquainted with the subject will best understand, as well as observation of the tone of thought expressed in our sceptical literature, led him to believe that a history, natural as well as literary, of doubt; an analysis of the forms and a statement of the intellectual causes of it, would have a value, direct and indirect, in many ways. His desire, he is willing to confess, was to guide the student, rather than to refute the unbeliever. He did not expect to furnish the combatant with ready-made weapons, which would make him omnipotent in conflict; but he hoped to give him some suggestions in reference to the tactics for conducting the contest. The Lectures have a polemical aspect, but they seek to obtain their end by means of the educational. The writer has aimed at assisting the student, in the struggle with his doubts, in the inquiry for truth, in the quiet meditative search for light and knowledge, preparatory to ministering to others. The survey of a new region, which ordinary works on the history of infidelity rarely touch, may lay bare unsuspected or undetected causes of unbelief; and thus indirectly offer a refutation of it; for intellectual error is refuted, when the origin of it is referred to false systems of thought. The anatomy of error is the first step to its cure. In another point of view, independently of the value of the line of inquiry generally, and the special suitability of it to individual minds, there is a further use, which in the present day belongs to it in common with all inquiries into the history of thought.