It is not unusual, in those who have no taste for speculation, and who understand only the prosaic, though in some respects the truer, philosophy of Scotland, to despise the great systems of German speculation. Yet, if the series be measured as an example of the power of the human mind, whatever may be the opinion formed in respect to its correctness, it stands among the most interesting efforts of thought. Though the writers can be matched by isolated examples in former ages, perhaps no series of writers exists, hardly even the Greek, certainly not the Neo-Platonist nor the Cartesian, which, in far-reaching penetration, in minuteness of analysis, in brilliancy of imagination, in loftiness of genius, in poetry of expression, in grasp of intellect, in influence on every branch of thought or life, approximates to the series of illustrious thinkers which commenced with Kant and ended with Hegel.(731) The two philosophers at this time whose teaching formed a new influence, were Fichte(732) and Jacobi.(733) Details in reference to their systems must be sought elsewhere.(734) It is only possible here to indicate their central thought, in order to notice their effects on theological inquiry. We have seen that Kant had reconsidered the great problem, commenced by Descartes and Locke, concerning the ground of certitude, and the nature of knowledge; and had revolutionised philosophy, by attributing to the natural structure of the mind many of those ideas which had usually been supposed to be derived from experience. In his system he had left two elements, a formal and a material; the formal, or innate forms, through which the mind gains knowledge, and the material, presented from external sources. It was the former or ideal element which was examined by Fichte; the latter by Jacobi. Fichte began to teach at Jena soon after 1790. Grasping firmly Descartes’ principle, “Cogito, ergo sum,” he conceived that, as we can only know ourselves, there is no proof that the datum supposed to be external is anything but a form of our own consciousness; and thus he arrived at a subjective idealism not unlike that of bishop Berkeley.(735) Under his view God was only an idea or form of thought; a regulative principle of human belief, the moral order of which the mind was conscious in the universe; and, as atheism was suspected to follow as an inference from his views, he became the subject of persecution. But the instincts of the heart, as well as the arguments of the understanding, were too potent for him; and when he had thus as it were shut up man within the circle of his own finite self, he strove to find a logical passage into a knowledge of the infinite by a principle analogous to that of Spinoza; viz. by regarding both self and the outer world, the subjective and objective, to be identified in some absolute self-existence, of which they were respectively phases.(736)