Excerpt: My aim here, as in the previous editions, has been not to construct a new original system of my own, but to resuscitate and make better known to English readers a Psychology that has already survived four and twenty centuries, that has had more influence on human thought and human language than all other psychologies together, and that still commands a far larger number of adherents than any rival doctrine. My desire, however, has been not merely to expound but to expand this old system; not merely to defend its assured truths, but to test its principles, to develop them, to apply them to the solution of modern problems; and to re-interpret its generalizations in the light of the most recent researches. I have striven to make clear to the student of modern thought that this ancient psychology is not quite so absurd, nor these old thinkers quite so foolish, as the current caricatures of their teaching would lead one to imagine; and I believe I have shown that not a little of what is supposed to be new has been anticipated, and that most of what is true can be assimilated without much difficulty by the old system. On the other hand, I have sought to bring the scholastic student into closer contact with modern questions; and to acquaint him better with some of the merits of modern psychological analysis and explanation. There is at least one phase of current psychological literature to which my opposition is in no way diminished -- the prevalent view that the science of psychology and the philosophy of the human mind can be shut up in water-tight compartments and rendered completely independent of each other. Indeed, the now customary vehement protestations of psychologists that their works are innocent of all philosophical beliefs -- if not also devoid of all metaphysical foundations -- and the austere gravity with which they are wont to apologize whenever they make mention of the soul, or allude to such irrelevant matters as the possibility of a future life, the origin of the human mind, or its connection with the body, have often appeared to me liable to give rise to the suspicion that the sense of humour is incompatible with psychological eminence. For it is now taken for granted by the most distinguished of these writers that of all human beings the student of psychology feels least interest in the question as to whether he has a soul, or what is to become of it; and that of all branches of human knowledge the science of the mind has least to say on such a topic. In fact, to trespass in such alien matters is universally assumed to be the gravest of professional delinquencies. Notwithstanding the weight of authority for this view, I have had the temerity to suggest that it is the most misleading and extravagant idolon of the psychological cave at the present day. I have even ventured to maintain throughout this work that to construct such a water-tight science of psychology, from which all metaphysical conceptions and beliefs have been effectually bailed out, is simply impossible. Accordingly, I warn my readers at the start that the analysis of mental activities which commends itself to me as the truest and most thorough, has resulted in the conception of the human mind as an immaterial being endowed with free-will and rational activity of a spiritual order; and that my exposition and interpretation of the phenomena lead back to this conclusion. At the same time my procedure throughout is purely rationalistic, in the sense of being based solely on experience and reasoning.