But what we have now considered between the plant and the animal, and then between the different species of animals, occurs also between man and man. Here also that which is secondary, the intellect, by means of the clearness of consciousness and distinctness of knowledge which depends upon it, constitutes a fundamental and immeasurably great difference in the whole manner of the existence, and thereby in the grade of it. The higher the consciousness has risen, the more distinct and connected are the thoughts, the clearer the perceptions the more intense the sensations. Through it everything gains more depth: emotion, sadness, joy, and sorrow. Commonplace blockheads are not even capable of real joy: they live on in dull insensibility. While to one man his consciousness only presents his own existence, together with the motives which must be apprehended for the purpose of sustaining and enlivening it, in a bare comprehension of the external world, it is to another a camera obscura in which the macrocosm exhibits itself:

 
“He feels that he holds a little world
Brooding in his brain,
That it begins to work and to live,
That he fain would give it forth.”
 

The difference of the whole manner of existence which the extremes of the gradation of intellectual capacity establish between man and man is so great that that between a king and a day labourer seems small in comparison. And here also, as in the case of the species of animals, a connection between the vehemence of the will and the height of the intellect can be shown. Genius is conditioned by a passionate temperament, and a phlegmatic genius is inconceivable: it seems as if an exceptionally vehement, thus a violently longing, will must be present if nature is to give an abnormally heightened intellect, as corresponding to it; while the merely physical account of this points to the greater energy with which the arteries of the head move the brain and increase its turgescence. Certainly, however, the quantity, quality, and form of the brain itself is the other and incomparably more rare condition of genius. On the other hand, phlegmatic persons are as a rule of very moderate mental power; and thus the northern, cold-blooded, and phlegmatic nations are in general noticeably inferior in mind to the southern vivacious and passionate peoples; although, as Bacon² has most pertinently remarked, if once a man of a northern nation is highly gifted by nature, he can then reach a grade which no southern ever attains to. It is accordingly as perverse as it is common to take the great minds of different nations as the standard for comparing their mental powers: for that is just attempting to prove the rule by the exceptions. It is rather the great majority of each nation that one has to consider: for one swallow does not make a summer. We have further to remark here that that very passionateness which is a condition of genius, bound up with its vivid apprehension of things, produces in practical life, where the will comes into play, and especially in the case of sudden occurrences, so great an excitement of the emotions that it disturbs and confuses the intellect; while the phlegmatic man in such a case still retains the full use of his mental faculties, though they are much more limited, and then accomplishes much more with them than the greatest genius can achieve. Accordingly a passionate temperament is favourable to the original quality of the intellect, but a phlegmatic temperament to its use. Therefore genius proper is only for theoretical achievements, for which it can choose and await its time, which will just be the time at which the will is entirely at rest, and no waves disturb the clear mirror of the comprehension of the world. On the other hand, genius is ill adapted and unserviceable for practical life, and is therefore for the most part unfortunate. Goethe's “Tasso” is written from this point of view. As now genius proper depends upon the absolute strength of the intellect, which must be purchased by a correspondingly excessive vehemence of disposition, so, on the other hand, the great pre-eminence in practical life that makes generals and statesmen depends upon the relative strength of the intellect, thus upon the highest degree of it that can be attained without too great excitability of the emotions, and too great vehemence of character, and that therefore can hold its own even in the storm. Great firmness of will and constancy of mind, together with a capable and fine understanding, are here sufficient; and whatever goes beyond this acts detrimentally, for too great a development of the intelligence directly impedes firmness of character and resolution of will. Hence this kind of eminence is not so abnormal, and is a hundred times less rare than the former kind; and accordingly we see great generals and great ministers appear in every age, whenever the merely external conditions are favourable to their efficiency. Great poets and philosophers, on the other hand, leave centuries waiting for them; and yet humanity may be contented even with this rare appearance of them, for their works remain, and do not exist only for the present, like the achievements of those other men. It is also quite in keeping with the 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