An adequate statement of the truth would be conducted as follows. First, the animal nature should be carefully analyzed, its province accurately defined, and both the laws and forms of its activity exactly stated. Second, a like examination of the spiritual person should follow; and third, the relations, interactions, and influences of the two parts upon each other should be, as extensively as possible, presented. But it is to be remarked, that, while the analysis, by the human intellect, of these two great departments of man's soul, may be exhaustive, it is doubtful if any but the All-seeing Eye can read all their relations and inter-communications. The development of the third point, by any one mind, must needs, therefore, be partial. Whether any portion of the above designated labor shall be hereafter entered upon, will depend upon circumstances beyond control of the writer. As will appear, it is believed, in the development of the subject, the great, the _vital_ point upon which the whole controversy with the Hamiltonian school must turn, is a question of _fact_; viz., whether man has a Reason, as the faculty giving _a priori_ principles, or not. If he has such a Reason, then by it the questions now at issue can be settled, and that finally. If he has no Reason, then he can have no knowledge, except of appearances and events, as perceived by the Sense and judged by the Understanding. Until, then, the question of fact is decided, it would be a gain if public attention was confined wholly to it. Establish first a well ascertained and sure foundation before erecting a superstructure. The method adopted in constructing this treatise does not admit the presentation of the matter in a symmetrical form. On the contrary, it involves some, perhaps many, repetitions. What has been said at one point respecting one author must be said again in reply to another. Yet the main object for which the work was undertaken could, it seemed, be thoroughly accomplished in no other way. The author has in each case used American editions of the works named. KNOW THE TRUTH. PART I. THE SEEKING AND THE FINDING. In April, 1859, there was republished in Boston, from an English print, a volume entitled "The Limits of Religious Thought Examined," &c., "by Henry Longueville Mansel, B. D."