"Human reason, in one sphere of its cognition, is called upon to consider questions, which it cannot decline, as they are presented by its own nature, but which it cannot answer, as they transcend every faculty of the mind. In this work the author undertakes a critical inquiry into the faculty of reason, with reference to the cognitions to which it strives to attain without the aid of experience; in other words, to solution of the question regarding the possibility or impossibility of Metaphysics and the determination of the origin, as well as of the extend and limits of this science. My chief aim in this work has been thoroughness; and I make bold to say, that there is not a single metaphysical problem that does not find its solution, or at least the key to its solution, here. Pure reason is a perfect unity; and therefore, if the principle presented by it prove to be insufficient for the solution of even a single one of those questions to which the very nature of reason gives birth, we must reject it, as we could not be perfectly certain of its sufficiency in the case of the others"--Preface. (PsycINFO Database Record (c) 2008 APA, all rights reserved) Part of PsycBOOKS collection.