law of the parsimony of nature referred to above that it bestows great eminence of mind in general upon very few, and genius only as the rarest of all exceptions, while it equips the great mass of the human race with no more mental power than is required for the maintenance of the individual and the species. For the great, and through their very satisfaction, constantly increasing needs of the human race make it necessary that the great majority of men should pass their lives in occupations of a coarsely physical and entirely mechanical description. And what would be the use to them of an active mind, a glowing imagination, a subtle understanding, and a profoundly penetrating intellect? These would only make them useless and unhappy. Therefore nature has thus gone about the most costly of all her productions in the least extravagant manner. In order not to judge unfairly one ought also to settle definitely one's expectations of the mental achievements of men generally from this point of view, and to regard, for example, even learned men, since as a rule they have become so only by the force of outward circumstances, primarily as men whom nature really intended to be tillers of the soil; indeed even professors of philosophy ought to be estimated according to this standard, and then their achievements will be found to come up to all fair expectations. It is worth noticing that in the south, where the necessities of life press less severely upon the human race, and more leisure is allowed, the mental faculties even of the multitude also become more active and finer. It is physiologically noteworthy that the preponderance of the mass of the brain over that of the spinal cord and the nerves, which, according to Sömmerring's acute discovery, affords the true and closest measure of the degree of intelligence both of species of brutes and of individual men, at the same time increases the direct power of moving, the agility of the limbs; because, through the great inequality of the relation, the dependence of all motor nerves upon the brain becomes more decided; and besides this the cerebellum, which is the primary controller of movements, shares the qualitative perfection of the cerebrum; thus through both all voluntary movements gain greater facility, rapidity, and manageableness, and by the concentration of the starting-point of all activity that arises which Lichtenberg praises in Garrick: “that he appeared to be present in all the muscles of his body.” Hence clumsiness in the movement of the body indicates clumsiness in the movement of the thoughts, and will be regarded as a sign of stupidity both in individuals and nations, as much as sleepiness of the countenance and vacancy of the glance. Another symptom of the physiological state of the case referred to is the fact that many persons are obliged at once to stand still whenever their conversation with any one who is walking with them begins to gain some connection; because their brain, as soon as it has to link together a few thoughts, has no longer as much power over as is required to keep the limbs in motion by means of the motory nerves, so closely is everything measured with them.
It results from this whole objective consideration of the intellect and its origin, that it is designed for the comprehension of those ends upon the attainment of which depends the individual life and its propagation, but by no means for deciphering the inner nature of things and of the world, which exists independently of the knower. What to the plant is the susceptibility to light, in consequence of which it guides its growth in the direction of it, that is, in kind, the knowledge of the brute, nay, even of man, although in degree it is increased in proportion as the needs of each of these beings demand. With them all apprehension remains a mere consciousness of their relations to other things, and is by no means intended to present again in the consciousness of the knower the peculiar, absolutely real nature of these things. Rather, as springing from the will, the intellect is also only designed for its service, thus for the apprehension of motives; it is adapted for this, and is therefore of a thoroughly practical tendency. This also holds good if we conceive the significance of life as ethical; for in this regard too we find man knowing only for the benefit of his conduct. Such a faculty of knowledge, existing exclusively for practical ends, will from its nature always comprehend only the relations of things to each other, but not the inner nature of them, as it is in itself. But to regard the complex of these relations as the absolute nature of the world as it is in itself, and the manner in which it necessarily exhibits itself in accordance with the laws predisposed in the brain as the eternal laws of the existence of all things, and then to construct ontology, cosmology, and theology in accordance with this view – this was really the old fundamental error, of which Kant's teaching has made an end. Here, then, our objective, and therefore for the most part physiological consideration of the intellect meets his transcendental consideration of it; nay, appears in a certain sense even as an a priori insight into it; for, from a point of view which we have taken up outside of it, our objective view enables us to know in its origin, and therefore as necessary, what that transcendental consideration, starting from facts of consciousness, presents only as a matter of fact. For it follows from our objective consideration of the intellect, that the world as idea, as it exists stretched out in space and time, and moves on regularly according to the strict law of causality, is primarily only a physiological phenomenon, a function of the brain, which brings it about, certainly upon the occasion of certain external stimuli, but yet in conformity with its own laws. Accordingly it is beforehand a matter of course, that what goes on in this function itself, and therefore through it and for it, must by no means be regarded as the nature of things in themselves, which exist independently of it and are entirely different from it, but primarily exhibits only the mode or manner of this function itself, which can always receive only a very subordinate modification through that which exists completely independently of it, and sets it in motion as a stimulus. As, then, Locke claimed for the organs of sense all that comes into our apprehension by means of the sensation, in order to deny that it belongs to things in themselves, so Kant, with the same intention, and pursuing the same path further, has proved all that makes perception proper possible, thus space, time, and causality, to be functions of the brain; although he has refrained from using this physiological expression, to which, however, our present method of investigation, coming from the opposite side, the side of the real, necessarily leads us. Kant arrived upon his analytical path at the result that what we know are mere phenomena. What this mysterious expression really means becomes clear from our objective and genetic investigation of the intellect. The phenomena are the motives for the aims of individual will as they exhibit themselves in the intellect which the will has produced for this purpose (which itself appears as a phenomenon objectively, as the brain), and which, when comprehended, as far as one can follow their concatenation, afford us in their connection the world which extends itself objectively in time and space, and which I call the world as idea. Moreover, from our point of view, the objectionable element vanishes which in the Kantian doctrine arises from the fact that, because the intellect knows merely phenomena instead of things as they are in themselves, nay, in consequence of this is led astray into paralogisms and unfounded hypostases by means of “sophistications, not of men but of the reason itself, from which even the wisest does not free himself, and if, perhaps indeed after much trouble, he avoids error, can yet never get quit of the illusion which unceasingly torments and mocks him” – because of all this, I say, the appearance arises that our intellect is intentionally designed to lead us into errors. For the objective view of the intellect given here, which contains a genesis of it, makes it conceivable that, being exclusively intended for practical ends, it is merely the medium of motives, and therefore fulfils its end by an accurate presentation of these, and that if we undertake to discover the nature of things in themselves, from the manifold phenomena which here exhibit themselves objectively to us, and their laws, we do this at our own peril and on our own responsibility. We have recognised that the original inner force of nature, without knowledge and working in the dark, which, if it has worked its way up to self-consciousness, reveals itself to this as will, attains to this grade only by the production of an animal brain and of knowledge, as its function, whereupon the phenomenon of the world of perception arises in this brain. But to explain this mere brain phenomenon, with the conformity to law which is invariably connected with its functions, as the objective inner nature of the world and the things in it, which is independent of the brain, existing before and after it, is clearly a spring which nothing warrants us in making. From this mundus phœnomenon, however, from this perception which arises under such a variety of conditions, all our conceptions are drawn. They have all their content from it, or even only in relation to it. Therefore, as Kant says, they are only for immanent, not for transcendental, use; that is to say, these conceptions of ours, this first material of thought, and consequently still more the judgments which result from their combination, are