The tendency of such speculations as these towards universal Skepticism, or even absolute Nihilism, with the exception only of certain fleeting phenomena of Consciousness, is too apparent to require any formal proof; and it must be equally evident that they contradict some of the most universal and deeply-rooted convictions of the human mind. The ultimate ground of every system of Idealism which excludes the knowledge of an external world must be one or other of these two assumptions, or a combination of both: either, that our knowledge cannot extend beyond the range of consciousness, which takes cognizance only of ideas, or of subjective mental states; or that any attempt to extend it beyond these limits, so as to embrace external objects as really existing, can only be successful on this condition,--that we _prove_, by reasoning from the subjective to the objective, that there is a necessary _logical_ connection between the state of the one and the reality of the other. Each of these assumptions is equally groundless. It is true that consciousness, strictly so called, takes cognizance only of what passes within; it is not true that consciousness, in this restricted sense, is commensurate with our entire knowledge. It is true that we acquire our knowledge only through the exercise of our mental faculties; it is not true that our mental faculties are the only sources of our knowledge, nor even that, without the concurrence of certain objects, they could give us any knowledge at all. It is true that there must be a connection between the subjective and the objective; it is not true that this connection must be established by _reasoning_, or that we must _prove_ the existence of an external world distinct from the thinking mind, before we are entitled to believe in it. For a great part of our knowledge is _presentative_, and we directly perceive the objects of Nature not less than the phenomena of Consciousness.
When it is said, in the jargon of the modern German philosophy, that "the Ego has no immediate consciousness of the Non-Ego as existing, but that the Non-Ego is only represented to us in a modification of the self-conscious Ego, and is, in fact, only a phenomenon of the Ego,"--a plain, practical Englishman, little tolerant of these subtle distinctions, might be ready, if not deterred by the mere sound of the words, to test them by a particular example. What am I to think, he might say, of my own father and mother? They are familiarly known to me. I have seen them, and talked with, them, and loved them as my own soul. I have hitherto believed that they existed, and that they were really a father and mother to me. But now I am taught that they are--mere modifications of my own mind; that they are nothing more than simple phenomena of the self-conscious Ego; and that, so far from being the earthly authors of my existence, they are themselves--the creation and offspring of my own thought. And on what ground am I asked to receive this astonishing discovery? Why, simply because I can be sure of nothing but the facts of consciousness. But how are _these facts proved_? They "need no proof; they are self-evident; they are immediately and irresistibly believed." Be it so. I can just as little doubt of the existence of my body, of the distinct personality of my parents, and the reality of an external universe, as of any fact of consciousness. May it not be, whether we can explain it or not, that the one set of facts is as directly _presented_, and needs as little to be _proved_, as the other?