Having thus arrived at conceptions, thoughts, judgments, another faculty comes in to classify the conceptions, link the thoughts together, reduce the judgments to general laws, draw inferences, fix conclusions, proceed from the particular to the general, recede from the general to the particular, mount from the conditioned to the unconditioned, till it arrives at ultimate principles. This faculty is reason,--the supreme faculty, above sensibility, above understanding. Reason gives the final generalization, the idea of a universe comprehending the infinitude of details presented by the senses, and the worlds of knowledge shaped by the understanding; the idea of a personality embracing the infinite complexities of feeling, and gathering under one dominion the realms of consciousness; the idea of a supreme unity combining in itself both the other ideas; the absolute perfection, the infinite and eternal One, which men describe by the word God. Here the thinker rested. His search could be carried no further. He had, as he believed, established the independent dominion of the mind, had mapped out its confines, had surveyed its surface; he had confronted the idealist with the reality of an external world; he had confronted the sceptic with laws of mind that were independent of experience; and, having done so much, he was satisfied, and refused to move an inch beyond the ground he occupied. To those who applied to him for a system of positive doctrines, or for ground on which a system of positive doctrines could be erected, he declined to give aid. The mind, he said, cannot go out of itself, cannot transgress its own limits. It has no faculty by which it can perceive things _as they are_; no vision to behold objects corresponding to its ideas; no power to bridge over the gulf between its own consciousness and a world of realities existing apart from it. Whether there be a spiritual universe answering to our conception, a Being justifying reason's idea of supreme unity, a soul that can exist in an eternal, supersensible world, are questions the philosopher declined to discuss. The contents of his own mind were revealed to him, no more. Kant laid the foundations, he built no structure. He would not put one stone upon another; he declared it to be beyond the power of man to put one stone upon another. The attempts which his earnest disciples--Fichte, for example--made to erect a temple on his foundation he repudiated. As the existence of an external world, though a necessary postulate, could not be demonstrated, but only logically affirmed; so the existence of a spiritual world of substantial entities corresponding to our conceptions, though a necessary inference, could only be logically affirmed, not demonstrated. Our idea of God is no proof that God exists. That there is a God may be an irresistible persuasion, but it can be nothing more; it cannot be knowledge. Of the facts of consciousness, the reality of the ideas in the mind, we may be