Book II: The Will.
Chapter II. Desire, Intellect, and Will..
§ 120.
But though feeling, in the sense explained, constitutes individuality, it does not in that sense amount to the full individuality of man. It does not make the human self what it is. Each of us is one or individual, not merely in the sense that he feels and is so far conscious, but in the sense that he presents his feelings to himself, that he distinguishes himself from them, and is conscious of them as manifold relations in which he, the single self, stands to the world,--in short, as manifold facts. It is thus only as self-conscious that we are capable of knowledge, because only as self-conscious that we are aware of being in the presence of facts. Only in virtue of self-consciousness is there for us a world to be known. In that sense man's self-consciousness is his understanding. This does not of course mean that the abstract form of self-consciousness is an intelligence of facts. We know nothing of self-consciousness apart from feeling, and are probably entitled to assume that there is no such thing. The self-consciousness therefore of which we speak includes feeling; not indeed feeling as it is before the stage of self-consciousness is reached, but feeling as it is for the self-conscious soul, or feeling as manifold recognised relation to an objective world. In this reality of its existence, in this actual co-operation with the senses, self-consciousness is the faculty of understanding, which in its full activity, with the progressive analysis of that which the senses contain or reveal, becomes knowledge, or the actual understanding of a world. In the same way self-consciousness is the faculty or possibility of desire, in so far as it is the characteristic of desire to be directed to objects present to the mind of the person desiring them. (§ 120 ¶ 1)
If this statement seems strange, it is because we are misled by our habit of abstraction. Regarding self-consciousness in unreal detachment from the sensations which to the self-conscious soul become intelligible facts, we find a paradox in the statement that it is the basis of understanding. For a like reason, because we are habituated to abstract self-consciousness from the wants and impulses which are the sequelæ of sensation, we stumble at the notion of our desires being founded on self-consciousness. We suppose self-consciousness, in short, apart from a soul and from the activities of sense and appetite which belong to a soul before self-consciousness supervenes. We then oppose it to those very faculties and acts of desire and understanding which are really its expression, in the sense that it is only as self-conscious that the soul exhibits them. No doubt, if self-consciousness were not the self-consciousness of a soul, if it did not supervene upon a sentient and appetitive life, it would not exhibit itself as understanding and desire; but neither would it be what it is at all. The forms of psychical activity on which it supervenes are carried on into it, though with a character altered by its supervention. They form its content, its filling; not one, however, which remains what it was upon the first manifestation of self-consciousness in the soul, but one which is constantly taking new determinations to itself through the activity of which self-consciousness is the distinguishing form. (§ 120 ¶ 2)