Of what “I” does Kant speak here? Perhaps of the Ego, which his followers quietly heap together by a manifold of representations, in no single one of which it was, but in all of which collectively it now is said to be. Then the words of Kant would signify this: I, who think D, am the same I who thought A, B and C, and it is only through the thinking of my manifold thinking, that I first became I to myself—that is to say, the _identical_ in the manifold? In that case Kant would have been just such a pitiable tattler as these Kantians; for in that case the possibility of all thinking would be conditioned, according to him, by another thinking, and by the thinking of this thinking; and I should like to know how we could ever arrive at a thinking. But, instead of tracing the consequences of Kant’s statement, I merely intended to cite his own words. He says again: “This representation, ‘_I_ think,’ is an act of spontaneity, i. e. it cannot be considered as belonging to ‘sensuousness’.“ (I add: and hence, also, not to inner sensuousness, to which the above described identity of consciousness most certainly does belong.) Kant continues: “I call it pure apperception, in order to distinguish it from the empirical (just described) apperception, and because it is that self-consciousness, which, in producing the representation ‘I think’—which must accompany all other representations, and is _in all consciousness one and the same_—can itself be accompanied by no other representation.” Here the character of pure self-consciousness is surely clearly enough described. It is in all consciousness the same—hence undeterminable by any accident of consciousness; in it the Ego is only determined through itself, and is thus absolutely determined. It is also clear here, that Kant could not have understood this pure apperception to mean the consciousness of our individuality, nor could he have taken the latter for the former; for the consciousness of my individuality, as an _I_, is necessarily conditioned by, and only possible through, the consciousness of another individuality, a _Thou_. Hence we discover in Kant’s writings the conception of the _pure Ego_ exactly as the Science of Knowledge has described it, and completely determined. Again, in what relation does Kant, in the above passage, place this pure Ego to all consciousness? As _conditioning the same_. Hence, according to Kant, the possibility of all consciousness is conditioned by the possibility of the pure Ego, or by pure self-consciousness, just as the Science of Knowledge holds. In thinking, the conditioning is made the prior of the conditioned—for this is the significance of that relation; and thus it appears that, according to Kant, a systematic deduction of all consciousness, or, which is the same, a System of Philosophy, must proceed from the pure Ego, just as the Science of Knowledge proceeds; and Kant himself has thus suggested the idea of such a Science.