of the intellect, but our will to live is a prius of the intellect. Thus this consideration also, which will be fully discussed in chapter 28, confirms the primacy of the will in self-consciousness.
12. On the other hand, nothing proves more clearly the secondary, dependent, conditioned nature of the intellect than its periodical intermittance. In deep sleep all knowing and forming of ideas ceases. But the kernel of our nature, the metaphysical part of it which the organic functions necessarily presuppose as their primum mobile, must never pause if life is not to cease, and, moreover, as something metaphysical and therefore incorporeal, it requires no rest. Therefore the philosophers who set up a soul as this metaphysical kernel, i.e., an originally and essentially knowing being, see themselves forced to the assertion that this soul is quite untiring in its perceiving and knowing, therefore continues these even in deep sleep; only that we have no recollection of this when we awake. The falseness of this assertion, however, was easy to see whenever one had rejected that soul in consequence of Kant's teaching. For sleep and waking prove to the unprejudiced mind in the clearest manner that knowing is a secondary function and conditioned by the organism, just like any other. Only the heart is untiring, because its beating and the circulation of the blood are not directly conditioned by nerves, but are just the original manifestation of the will. Also all other physiological functions governed merely by ganglionic nerves, which have only a very indirect and distant connection with the brain, are carried on during sleep, although the secretions take place more slowly; the beating of the heart itself, on account of its dependence upon respiration, which is conditioned by the cerebral system (medulla oblongata), becomes with it a little slower. The stomach is perhaps most active in sleep, which is to be attributed to its special consensus with the now resting brain, which occasions mutual disturbances. The brain alone, and with it knowing, pauses entirely in
