In respect to this tardiness of progress, which most assuredly is at least not inconsistent with true philosophy, I can appeal to my own instance, which in such a case is, I hope, allowable. It is now nine-and-thirty years since I first read, with indescribable avidity, the entire works of Plato in the original; and ever since, amid many other scientific studies, philosophical research has been my principal and favorite avocation. In this pursuit many and various have been the systems of science--of discord and of error--that I have had to wander through. Satisfied neither with the opinions of others nor with my own views, I felt reluctant to come forward with a system of my own. In the mean while my view of philosophy has been in a state of inchoation and of tardy but progressive development. Slowly and incompletely, little by little, incidentally and fragmentarily, at different epochs, has some of its principles come to the light, or escaped me in my earlier literary works and compositions--an explanation which I do not consider superfluous, even for those who are best acquainted with them. But the more I held fast to the two poles of divine faith and of supreme science, which as such is also divine, the firmer footing did I gain in that point and that center in the everlasting Beginning, in which both are one and cease to be at issue, but rather intimately cohering, do but lend fresh life, strength, and elevation to each other. And now at length I believe I have attained to that point when, fully persuaded myself of this unity of science and faith as grounded in God, I may safely indulge the wish to impart to others this important truth, publicly to set it forth, and develop it to the whole world. And it is to me no slight cause of congratulation that I am to enter upon this task in the present place and in the present manner. Besides those points of correlation already pointed out, between the highest science and faith, there is still another way in which the former, in its all-embracing notion of the triple life of the primal cause and force, is referred to faith, and even to its positive articles and its divine authority. It is obliged to appeal to this, in order to find and maintain its guiding rule and correct standard for the further application and development of this highest and fundamental notion, and to keep it dear of all erroneous and extravagant excrescences. The necessity of this will be best and most simply shown by a few historical instances.