To one whose aim is, to "serve his generation according to the Will of God," but two reasons would seem to justify an individual in claiming the attention of the public in the capacity of an author--the existence in the public mind of a want which needs to be met, and the full belief, that the Work which he has produced is adapted to meet that want. Under the influence of these two considerations, the following Treatise is presented to the public. Whether the author has judged rightly or not, it is not for him to decide. The decision of that question is left with the public, to whom the Work is now presented. It is doubtful, whether any work, prepared with much thought and pains-taking, was ever published with the conviction, on the part of the author, that it was unworthy of public regard. The community, however, may differ from him entirely on the subject; and, as a consequence, a work which he regards as so imperiously demanded by the public interest, falls dead from the press. Many an author, thus disappointed, has had occasion to be reminded of the admonition, "Ye have need of patience." Whether the following Treatise shall succeed in gaining the public ear, or not, one consolation will remain with the writer, the publication of the work has satisfied his sense of duty. To his respected Associates in the Institution over which he presides, Associates with whose approbation and counsel the work was prepared, the Author would take this occasion publicly to express his grateful acknowledgments for the many important suggestions which he received from them, during the progress of its preparation. Having said thus much, he would simply add, that, TO THE LOVERS OF TRUTH, THE WORK IS NOW RESPECTFULLY DEDICATED, WITH THE KIND REGARDS OF THE AUTHOR. CHAPTER I. INTRODUCTORY OBSERVATIONS. IMPORTANCE OF THE SUBJECT. THE doctrine of the Will is a cardinal doctrine of theology, as well as of mental philosophy. This doctrine, to say the least, is one of the great central points, from which the various different and conflicting systems of theological, mental, and moral science, take their departure. To determine a man's sentiments in respect to the Will, is to determine his position, in most important respects, as a theologian, and mental and moral philosopher. If we turn our thoughts inward, for the purpose of knowing what we are, what we ought to do, and to be, and what we shall become, as the result of being and doing what we ought or ought not, this doctrine presents itself at once, as one of the great pivots on which the resolution of all these questions turns.