1. Because the former has a _direct_, while the latter has only an _indirect_ bearing upon the subject. 2. Of the former our ideas are perfectly clear and distinct, while of the mode, the degree, and the nature of the Divine foreknowledge we are profoundly ignorant. To all eternity, our ideas of the nature of commands and prohibitions, of obligations, of merit and demerit, and of reward and punishment grounded on moral desert, can never be more clear and distinct than they now are. From such truths, then, and not from those that we do not understand, and which at the utmost have only an indirect bearing upon the subject, we ought to reason, if we reason at all, to the philosophy of the Will pre-supposed in the Scriptures. The reader is now put in possession of the _method_ that will be pursued in the following treatise, and is consequently prepared to enter upon the investigation of the subject before us. CHAPTER II. CLASSIFICATION OF THE MENTAL FACULTIES. EVERY individual who has reflected with any degree of interest upon the operations of his own mind, cannot have failed to notice three classes of mental phenomena, each of which is entirely distinct from either of the others. These phenomena, which comprehend the entire operations of the mind, and which may be expressed by the terms _thinking_, _feeling_, and _willing_, clearly indicate in the mind three faculties equally distinct from one another. These faculties are denominated the Intellect, the Sensibility or Sensitivity, and the Will. To the first, all intellectual operations, such as perceiving, thinking, judging, knowing, &c., are referred. To the second, we refer all sensitive states, all feelings, such as sensations, emotions, desires, &c. To the Will, or the active voluntary faculty, are referred all mental determinations, such as purposes, intentions, resolutions, choices and volitions. CLASSIFICATION VERIFIED. 1. The classes of phenomena, by which this tri-unity of the mental powers is indicated, differ from one another, not in _degree_, but in _kind_. Thought, whether clear or obscure, in all degrees, remains equally distinct, in its nature, from feelings and determinations of every class. So of feelings. Sensations, emotions, desires, all the phenomena of the Sensibility, in all degrees and modifications, remain, in their nature and essential characteristics, equally distinct from thought on the one hand, and the action of the Will on the other. The same holds true of the phenomena of the Will. A resolution, for example, in one degree, is not a thought in another, a sensation, emotion, or desire and in another a choice, purpose, intention, or volition. In all degrees and modifications, the phenomena of the Will, in their nature and essential characteristics, remain equally distinct from the operations of the Intelligence on the one hand, and of the Sensibility on the other.