Not, indeed, that I would recommend that blind syncretism which destroyed the school of Alexandria, which attempted to bring contrary systems together by force; what I recommend is an enlightened eclecticism, which, judging with equity, and even with benevolence, all schools, borrows from them what they possess of the true, and neglects what in them is false. Since the spirit of party has hitherto succeeded so ill with us, let us try the spirit of conciliation. Human thought is immense. Each school has looked at it only from its own point of view. This point of view is not false, but it is incomplete, and moreover, it is exclusive. It expresses but one side of truth, and rejects all the others. The question is not to decry and recommence the work of our predecessors, but to perfect it in reuniting, and in fortifying by that reunion, all the truths scattered in the different systems which the eighteenth century has transmitted to us. Such is the principle to which we have been conducted by two years of study upon modern philosophy, from Descartes to our times. This principle, badly disengaged at first, we applied for the first time within the narrowest limits, and only to theories relative to the question of personal existence.[14] We then extended it to a greater number of questions and theories; we touched the principal points of the intellectual and moral order,[15] and at the same time that we were continuing the investigations of our illustrious predecessor, M. Royer-Collard, upon the schools of France, England, and Scotland, we commenced the study new among us, the difficult but interesting and fecund study, of the philosophy of Koenigsberg. We can at the present time, therefore, embrace all the schools of the eighteenth century, and all the problems which they agitated. Philosophy, in all times, turns upon the fundamental ideas of the true, the beautiful, and the good. The idea of the true, philosophically developed, is psychology, logic, metaphysic; the idea of the good is private and public morals; the idea of the beautiful is that science which, in Germany, is called aesthetics, the details of which pertain to the criticism of literature, the criticism of arts, but whose general principles have always occupied a more or less considerable place in the researches, and even in the teaching of philosophers, from Plato and Aristotle to Hutcheson and Kant. Upon these essential points which constitute the entire domain of philosophy, we will successively interrogate the principal schools of the eighteenth century.