This book has been written simply in the interest of Truth. It was because the doctrines of the Hamiltonian School were believed to be dangerous errors, which this process of thought exposes, that it was undertaken.

Logically, and in the final analysis, there can be but two systems of philosophical theology in the world. The one will be Pantheism, or Atheism,—both of which contain the same essential principle, but viewed from different standpoints,—the other will be a pure Theism. In the schools of Brahma and Buddh, or in the schools of Christ, the truth is to be found. And this is so because every teacher is to be held responsible for all which can be logically deduced from his system; and every erroneous result which can be so deduced is decisive of the presence of an error in principle in the foundation; and all schemes of philosophy, by such a trial, are seen to be based on one of these two classes of schools. Just here a quotation from Dr. Laurens Hickok's "Rational Psychology" will be in point:

"Except as we determine the absolute to be personality wholly out of and beyond all the conditions and modes of space and time, we can by no possibility leave nature for the supernatural. The clear-sighted and honest intellect, resting in this conclusion that the conditions of space and time cannot be transcended, will be Atheistic; while the deluded intellect, which has put the false play of the discursive understanding in its abstract speculations for the decisions of an all-embracing reason, and deems itself so fortunate as to have found a deity within the modes of space and time, will be Pantheistic. The Pantheism will be ideal and transcendent, when it reaches its conclusions by a logical process in the abstract law of thought; and it will be material and empiric, when it concludes from the fixed connections of cause and effect in the generalized law of nature; but in neither case is the Pantheism any other than Atheism, for the Deity, circumscribed in the conditions of space and time with nature, is but nature still, and, whether in abstract thought or generalized reality, is no God."

The Hamiltonian system is logically Atheism. Perceiving that the Deity cannot be found in Nature, it denies that he can be known at all. What the mind cannot know at all, it is irrational to believe. If man cannot know that God is, and have a clear sight of his attributes as a rational ground of confidence in what he says, it is the height of blind credulity to believe in him. And more; if man cannot have such knowledge, he has no standard by which to measure teachings, and be sure he has the truth. Under such circumstances, faith is impossible. Faith can only be based on Reason. If there is no Reason, there can be no faith. Hence he who talks about faith, and denies Reason, does not know what faith is. The logician rightfully held that God could not be found in Nature; but he was just as wrong in asserting that man is wholly in Nature and cannot know God, as he was right in the former instance. The acceptance of his one truth, and one error, compels man to be an Atheist; because then he has no faculty by which to know aught of God; and few thorough men will accept blind credulity as the basis of Religion.

The author's sense of obligation to President Hickok cannot be too strongly stated. But for his works, it is believed that this little treatise could never have been written. Indeed, the author looks for but scanty credit on the score of originality, since most of what he has written he has learned, directly or indirectly, from that profound thinker. He has deemed it his chief work, to apply the principles developed by others to the exposure of a great error. And if he shall be judged to have accomplished this, his ambition will have been satisfied.

After the substance of this treatise had been thought out, and while the author was committing it to paper, the essays on "Space and Time," and on "The Philosophy of the Unconditioned," in the numbers of the "North American Review" for July and October, 1864, happened to fall under his notice. Some persons will appreciate the delight and avidity with which he read them; and how grateful it was to an obscure student, almost wholly isolated in the world, to find the views which he had wrought out in his secluded chamber, so ably advocated in the leading review of his country. Not that he had gone as far, or examined the subjects in hand as thoroughly as has been there done. By no means. Rather what results he had attained accord with some of those therein laid down. Of those essays it is not too much to say, that, if they have not exhausted the topics of which they treat, they have settled forever the conclusions to be reached, and leave for other writers only illustration and comment. If the author shall seem to differ from them on a minor question,—that of quantitative infinity,—the difference will, it is believed, be found to be one of the form of expression only. And the difference is maintained from the conviction that no term in science should have more than one signification. It is better to adopt illimitable and indivisible, as the technical epithets of Space, in place of the commonly used terms infinite and absolute.

A metaphysical distinction has been incidentally touched upon in the following discussion, which deserves a more extensive consideration than the scope and plan of this work would permit to it here; and which, so far as the author's limited reading goes, has received very little attention from modern writers on metaphysics. He refers to the distinction between the animal nature and spiritual person, so repeatedly enounced by that profound metaphysical theologian, the apostle Paul, and by that pure spiritual pastor, the apostle John, in the terms "flesh" and "spirit." The thinkers of the world, even the best Christian philosophers, seem to have esteemed this a moral and religious distinction, and no more, when in fact it cleaves down through the whole human being, and forms the first great radical division in any proper analysis of man's soul, and classification of his constituent elements. This is a purely natural division. It is organic in man. It belonged as much to Adam in his purity, as it does to the most degraded wretch on the globe now. It is of such a character that, had it been properly understood and developed, the Hamiltonian system of philosophy could never have been constructed.

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.