The following may also serve to illustrate this consideration. The will, which constitutes our true being, is of a simple nature; it merely wills, and does not know. The subject of knowledge, on the other hand, is a secondary phenomenon, arising from the objectification of the will; it is the point of unity of the sensibility of the nervous system, as it were the focus in which the rays of the activity of all the parts of the brain unite. With this, then, it must perish. In self-consciousness, as that which alone knows, it stands over against the will as its spectator, and, although sprung from it, knows it as something different from itself, something foreign to it, and consequently also only empirically, in time, by degrees, in its successive excitements and acts, and also learns its decisions only _a posteriori_, and often very indirectly. This explains the fact that our own nature is a riddle to us, _i.e._, to our intellect, and that the individual regards itself as having newly arisen and as perishable; although its true nature is independent of time, thus is eternal. As now the _will_ does not _know_, so conversely the intellect, or the subject of knowledge, is simply and solely _knowing_, without ever _willing_. This can be proved even physically in the fact that, as was already mentioned in the second book, according to Bichat, the various emotions directly affect all parts of the organism and disturb their functions, with the exception of the brain, which can only be affected by them very indirectly, _i.e._, just in consequence of those disturbances (_De la vie et de la mort_, art. 6, § 2). But from this it follows that the subject of knowledge, for itself and as such, cannot take part or interest in anything, but for it the being or not being of everything, nay, even of its own self, is a matter of indifference. Now why should this purely neutral being be immortal? It ends with the temporal manifestation of the will, _i.e._, the individual, as it arose with it. It is the lantern which is extinguished when it has served its end. The intellect, like the perceptible world which exists only in it, is a mere phenomenon; but the finiteness of both does not affect that of which they are the phenomenal appearance. The intellect is the function of the cerebral nervous system; but the latter, like the rest of the body, is the objectivity of the _will_. Therefore the intellect depends upon the somatic life of the organism; but this itself depends upon the will. The organised body may thus, in a certain sense, be regarded as the link between the will and the intellect; although really it is only the will itself exhibiting itself spatially in the perception of the intellect. Death and birth are the constant renewal of the consciousness of the will, in itself without end and without beginning, which alone is, as it were, the substance of existence (but each such renewal brings a new possibility of the denial of the will to live). Consciousness is the life of the subject of knowledge, or the brain, and death is its end. And therefore, finally, consciousness is always new, in each case beginning at the beginning. The will alone is permanent; and, moreover, it is it alone that permanence concerns; for it is the will to live. The knowing subject for itself is not concerned about anything. In the ego, however, the two are bound up together. In every animal existence the will has achieved an intellect which is the light by which it here pursues its ends. It may be remarked by the way that the fear of death may also partly depend upon the fact that the individual will is so loath to separate from the intellect which has fallen to its lot through the course of nature, its guide and guard, without which it knows that it is helpless and blind.