We shall now first of all verify and also elucidate this thesis by the following facts connected with the inner life of man; and on this opportunity perhaps more will be done for the knowledge of the inner man than is to be found in many systematic psychologies.
1. Not only the consciousness of other things, _i.e._, the apprehension of the external world, but also _self-consciousness_, contains, as was mentioned already above, a knower and a known; otherwise it would not be _consciousness_. For _consciousness_ consists in knowing; but knowing requires a knower and a known; therefore there could be no self-consciousness if there were not in it also a known opposed to the knower and different from it. As there can be no object without a subject, so also there can be no subject without an object, _i.e._, no knower without something different from it which is known. Therefore a consciousness which is through and through pure intelligence is impossible. The intelligence is like the sun, which does not illuminate space if there is no object from which its rays are reflected. The knower himself, as such, cannot be known; otherwise he would be the known of another knower. But now, as the _known_ in self-consciousness we find exclusively the _will_. For not merely willing and purposing in the narrowest sense, but also all striving, wishing, shunning, hoping, fearing, loving, hating, in short, all that directly constitutes our own weal and woe, desire and aversion, is clearly only affection of the will, is a moving, a modification of willing and not-willing, is just that which, if it takes outward effect, exhibits itself as an act of will proper.(31) In all knowledge, however, the known is first and essential, not the knower; for the former is the πρωτοτυπος, the latter the εκτυπος. Therefore in self-consciousness also the known, thus the will, must be what is first and original; the knower, on the other hand, only what is secondary, that which has been added, the mirror. They are related very much as the luminous to the reflecting body; or, again, as the vibrating strings to the resounding-board, in which case the note produced would be consciousness. We may also regard the plant as a like symbol of consciousness. It has, we know, two poles, the root and the corona: the former struggling into darkness, moisture, and cold, the latter into light, dryness, and warmth; then, as the point of indifference of the two poles, where they part asunder, close to the ground, the collum (_rhizoma_, _le collet_). The root is what is essential, original, perennial, the death of which involves that of the corona, is thus the primary; the corona, on the other hand, is the ostensible, but it has sprung from something else, and it passes away without the root dying; it is thus secondary. The root represents the will, the corona the intellect, and the point of indifference of the two, the collum, would be the _I_, which, as their common termination, belongs to both. This I is the _pro tempore_ identical subject of knowing and willing, whose identity I called in my very first essay (on the principle of sufficient reason), and in my first philosophical wonder, the miracle κατ εξοχην. It is the temporal starting-point and connecting-link of the whole phenomenon, _i.e._, of the objectification of the will: it conditions indeed the phenomenon, but is also conditioned by it. This comparison may even be carried to the individual nature of men. As a large corona commonly springs only from a large root, so the greatest intellectual capabilities are only found in connection with a vehement and passionate will. A genius of a phlegmatic character and weak passions would resemble those succulent plants that, with a considerable corona consisting of thick leaves, have very small roots; will not, however, be found. That vehemence of will and passionateness of character are conditions of heightened intelligence exhibits itself physiologically through the fact that the activity of the brain is conditioned by the movement which the great arteries running towards the _basis cerebri_ impart to it with each pulsation; therefore an energetic pulse, and even, according to Bichat, a short neck, is a requisite of great activity of the brain. But the opposite of the above certainly occurs: vehement desires, passionate, violent character, along with weak intellect, _i.e._, a small brain of bad conformation in a thick skull. This is a phenomenon as common as it is repulsive: we might perhaps compare it to beetroot.