The World as Will and Representation
Source: The World as Will and Representation (1819, republished 1851). Dover Edition, 1969, translated by E F J Payne. Reproduced here, sections 17 - 20, The Objectification of Will.
The World as Will.
First Aspect: The Objectification of the Will
§17.
In the first book we considered the representation only as such, and hence only according to the general form. It is true that, so far as the abstract representation, the concept, is concerned, we also obtained a knowledge of it according to its content, in so far as it has all content and meaning only through its relation to the representation of perception, without which it would be worthless and empty. Therefore, directing our attention entirely to the representation of perception, we shall endeavour to arrive at a knowledge of its content, its more precise determinations, and the forms it presents to us. It will be of special interest for us to obtain information about its real significance, that significance, otherwise merely felt, by virtue of which these pictures or images do not march past us strange and meaningless, as they would otherwise inevitably do, but speak to us directly, are understood, and acquire an interest that engrosses our whole nature.
We direct our attention to mathematics, natural science, and philosophy, each of which holds out the hope that it will furnish a part of the information desired. In the first place, we find philosophy to be a monster with many heads, each of which speaks a different language. Of course, they are not all at variance with one another on the point here mentioned, the significance of the representation of perception. For, with the exception of the Sceptics and Idealists, the others in the main speak fairly consistently of an object forming the basis of the representation. This object indeed is different in its whole being and nature from the representation, but yet is in all respects as like it as one egg is like another. But this does not help us, for we do not at all know how to distinguish that object from the representation. We find that the two are one and the same, for every object always and eternally presupposes a subject, and thus remains representation. We then recognise also that being-object belongs to the most universal form of the representation, which is precisely the division into object and subject. Further, the principle of sufficient reason, to which we here refer, is also for us only the form of the representation, namely the regular and orderly combination of one representation with another and not the combination of the whole finite or infinite series of representations with something which is not representation at all, and is therefore not capable of being in any way represented. We spoke above of the Sceptics and Idealists, when discussing the controversy about the reality of the external world.Now if we look to mathematics for the desired more detailed knowledge of the representation of perception, which we have come to know only quite generally according to the mere form, then this science will tell us about these representations only in so far as they occupy time and space, in other words, only in so far as they are quantities. It will state with extreme accuracy the How-many and the How-large; but as this is always only relative, that is to say, a comparison of one representation with another, and even that only from the one-sided aspect of quantity, this too will not be the information for which principally we are looking.
Finally, if we look at the wide province of natural science, which is divided into many fields, we can first of all distinguish two main divisions. It is either a description of forms and shapes, which I call Morphology; or an explanation of changes, which I call Etiology. The former considers the permanent forms, the latter the changing matter, according to the laws of its transition from one form into another. Morphology is what we call natural history in its whole range, though not in the literal sense of the word. As botany and zoology especially, it teaches us about the various, permanent, organic, and thus definitely determined forms in spite of the incessant change of individuals; and these forms constitute a great part of the content of the perceptive representation. In natural history they are classified, separated, united, and arranged according to natural and artificial systems, and brought under concepts that render possible a survey and knowledge of them all. There is further demonstrated an infinitely fine and shaded analogy in the whole and in the parts of these forms which runs through them all (unité de plan), by virtue of which they are like the many different variations on an unspecified theme. The passage of matter into those forms, in other words the origin of individuals, is not a main part of the consideration, for every individual springs from its like through generation, which everywhere is equally mysterious, and has so far baffled clear knowledge. But the little that is known of this finds its place in physiology, which belongs to etiological natural science. Mineralogy, especially where it becomes geology, though it belongs mainly to morphology, also inclines to this etiological science. Etiology proper includes all the branches of natural science in which the main concern everywhere is knowledge of cause and effect. These sciences teach how, according to an invariable rule, one state of matter is necessarily followed by another definite state; how one definite change necessarily conditions and brings about another definite change; this demonstration is called explanation. Here we find principally mechanics, physics, chemistry, and physiology.
But if we devote ourselves to its teaching, we soon become aware that the information we are chiefly looking for no more comes to us from Etiology than it does from morphology. The latter presents us with innumerable and infinitely varied forms that are nevertheless related by an unmistakable family likeness. For us they are representations that in this way remain eternally strange to us, and, when considered merely in this way, they stand before us like hieroglyphics that are not understood. On the other hand, Etiology teaches us that, according to the law of cause and effect, this definite condition of matter produces that other condition, and with this it has explained it, and has done its part. At bottom, however, it does nothing more than show the orderly arrangement according to which the states or conditions appear in space and time, and teach for all cases what phenomenon must necessarily appear at this time and in this place. It therefore determines for them their position in time and space according to a law whose definite content has been taught by experience, yet whose universal form and necessity are known to us independently of experience. But in this way we do not obtain the slightest information about the inner nature of any one of these phenomena. This is called a natural force, and lies outside the province of etiological explanation, which calls the unalterable constancy with which the manifestation of such a force appears whenever its known conditions are present, a law of nature. But this law of nature, these conditions, this appearance in a definite place at a definite time, are all that it knows, or ever can know. The-force itself that is manifested, the inner nature of the phenomena that appear in accordance with those laws, remain for it an eternal secret, something entirely strange and unknown, in the case of the simplest as well as of the most complicated phenomenon. For although Etiology has so far achieved its aim most completely in mechanics, and least so in physiology, the force by virtue of which a stone falls to the ground, or one body repels another, is, in its inner nature, just as strange and mysterious as that which produces the movements and growth of an animal. Mechanics presupposes matter, weight, impenetrability, communicability of motion through impact, rigidity, and so on as unfathomable; it calls them forces of nature, and their necessary and regular appearance under certain conditions a law of nature. Only then does its explanation begin, and that consists in stating truly and with mathematical precision how, where, and when each force manifests itself, and referring to one of those forces every phenomenon that comes before it. Physics, chemistry, and physiology do the same in their province, only they presuppose much more and achieve less. Consequently, even the most perfect etiological explanation of the whole of nature would never be more in reality than a record of inexplicable forces, and a reliable statement of the rule by which their phenomena appear, succeed, and make way for one another in time and space. But the inner nature of the forces that thus appear was always bound to be left unexplained by Etiology, which had to stop at the phenomenon and its arrangement, since the law followed by Etiology does not go beyond this. In this respect it could be compared to a section of a piece of marble showing many different veins side by side, but not letting us know the course of these veins from the interior of the marble to the surface. Or, if I may be permitted a facetious comparison, because it is more striking, the philosophical investigator must always feel in regard to the complete Etiology of the whole of nature like a man who, without knowing how, is brought into a company quite unknown to him, each member of which in turn presents to him another as his friend and cousin, and thus makes them sufficiently acquainted. The man himself, however, while assuring each person introduced of his pleasure at meeting him, always has on his lips the question: "But how the deuce do I stand to the whole company?"
Hence, about those phenomena known by us only as our representations, Etiology can never give us the desired information that leads us beyond them. For after all its explanations, they still stand quite strange before us, as mere representations whose significance we do not understand.- The causal connexion merely gives the rule and relative order of their appearance in space and time, but affords us no further knowledge of that which so appears. Moreover, the law of causality itself has validity only for representations, for objects of a definite class, and has meaning only when they are assumed. Hence, like these objects themselves, it always exists only in relation to the subject, and so conditionally. Thus it is just as well known when we start from the subject, i.e., a priori, as when we start from the object, i.e., a posteriori, as Kant has taught us.
But what now prompts us to make enquiries is that we are not satisfied with knowing that we have representations, that they are such and such, and that they are connected according to this or that law, whose general expression is always the principle of sufficient reason. We want to know the significance of those representations; we ask whether this world is nothing more than representation. In that case, it would inevitably pass by us like an empty dream, or a ghostly vision not worth our consideration. Or we ask whether it is something else, something in addition, and if so what that something is. This much is certain, namely that this something about which we are enquiring must be by its whole nature completely and fundamentally different from the representation; and so the forms and laws of the representation must be wholly foreign to it. We cannot, then, reach it from the representation under the guidance of those laws that merely combine objects, representations, with one another; these are the forms of the principle of sufficient reason.
Here we already see that we can never get at the inner nature of things from without. However much we may investigate, we obtain nothing but images and names. We are like a man who goes round a castle, looking in vain for an entrance, and sometimes sketching the facades. Yet this is the path that all philosophers before me have followed.
§18.
In fact, the meaning that I am looking for of the world that stands before me simply as my representation, or the transition from it as mere representation of the knowing subject to whatever it may be besides this, could never be found if the investigator himself were nothing more than the purely knowing subject (a winged cherub without a body). But he himself is rooted in that world; and thus he finds himself in it as an individual, in other words, his knowledge, which is the conditional supporter of the whole world as representation, is nevertheless given entirely through the medium of a body, and the affections of this body are, as we have shown, the starting-point for the understanding in its perception of this world. For the purely knowing subject as such, this body is a representation like any other, an object among objects. Its movements and actions are so far known to him in just the same way as the changes of all other objects of perception; and they would be equally strange and incomprehensible to him, if their meaning were not unravelled for him in an entirely different way. Otherwise, he would see his conduct follow on presented motives with the constancy of a law of nature, just as the changes of other objects follow upon causes, stimuli, and motives. But he would be no nearer to understanding the influence of the motives than he is to understanding the connexion with its cause of any other effect that appears before him. He would then also call the inner, to him incomprehensible, nature of those manifestations and actions of his body a force, a quality, or a character, just as he pleased, but he would have no further insight into it. All this, however, is not the case; on the contrary, the answer to the riddle is given to the subject of knowledge appearing as individual, and this answer is given in the word Will. This and this alone gives him the key to his own phenomenon, reveals to him the significance and shows him the inner mechanism of his being, his actions, his movements. To the subject of knowing, who appears as an individual only through his identity with the body, this body is given in two entirely different ways. It is given in intelligent perception as representation, as an object among objects, liable to the laws of these objects. But it is also given in quite a different way, namely as what is known immediately to everyone, and is denoted by the word will. Every true act of his will is also at once and inevitably a movement of his body; he cannot actually will the act without at the same time being aware that it appears as a movement of the body. The act of will and the action of the body are not two different states objectively known connected by the bond of causality; they do not stand in the relation of cause and effect, but are one and the same thing, though given in two entirely different ways, first quite directly, and then in perception for the understanding. The action of the body is nothing but the act of will objectified, i.e., translated into perception. Later on we shall see that this applies to every movement of the body, not merely to movement following on motives, but also to involuntary movement following on mere stimuli; indeed, that the whole body is nothing but the objectified will, i.e., will that has become representation. All this will follow and become clear in the course of our discussion. Therefore the body, which in the previous book and in the essay On the Principle of Sufficient Reason I called the immediate object, according to the one-sided viewpoint deliberately taken there (namely that of the representation), will here from another point of view be called the objectivity of the will. Therefore, in a certain sense, it can also be said that the will is knowledge a priori of the body, and that the body is knowledge a posteriori of the will. Resolutions of the will relating to the future are mere deliberations of reason about what will be willed at some time, not real acts of will. Only the carrying out stamps the resolve; till then, it is always a mere intention that can be altered; it exists only in reason, in the abstract. Only in reflection are willing and acting different; in reality they are one. Every true, genuine, immediate act of the will is also at once and directly a manifest act of the body; and correspondingly, on the other hand, every impression on the body is also at once and directly an impression on the will. As such, it is called pain when it is contrary to the will, and gratification or pleasure when in accordance with the will. The gradations of the two are very different. However, we are quite wrong in calling pain and pleasure representations, for they are not these at all, but immediate affections of the will in its phenomenon, the body; an enforced, instantaneous willing or not-willing of the impression undergone by the body. There are only a certain few impressions on the body which do not rouse the will, and through these alone is the body an immediate object of knowledge; for, as perception in the understanding, the body is an indirect object like all other objects. These impressions are therefore to be regarded directly as mere representations, and hence to be excepted from what has just been said. Here are meant the affections of the purely objective senses of sight, hearing, and touch, although only in so far as their organs are affected in the specific natural way that is specially characteristic of them. This is such an exceedingly feeble stimulation of the enhanced and specifically modified sensibility of these parts that it does not affect the will, but, undisturbed by any excitement of the will, only furnishes for the understanding data from which perception arises. But every stronger or heterogeneous affection of these sense-organs is painful, in other words, is against the will; hence they too belong to its objectivity. Weakness of the nerves shows itself in the fact that the impressions which should have merely that degree of intensity that is sufficient to make them data for the understanding, reach the higher degree at which they stir the will, that is to say, excite pain or pleasure, though more often pain. This pain, however, is in part dull and inarticulate; thus it not merely causes us to feel painfully particular tones and intense light, but also gives rise generally to a morbid and hypochondriacal disposition without being distinctly recognised. The identity of the body and the will further shows itself, among other things, in the fact that every vehement and excessive movement of the will, in other words, every emotion, agitates the body and its inner workings directly and immediately, and disturbs the course of its vital functions. This is specially discussed in The Will in Nature.
Finally, the knowledge I have of my will, although an immediate knowledge, cannot be separated from that of my body. I know my will not as a whole, not as a unity, not completely according to its nature, but only in its individual acts, and hence in time, which is the form of my body's appearing, as it is of every body. Therefore, the body is the condition of knowledge of my will. Accordingly, I cannot really imagine this will without my body. In the essay On the Principle of Sufficient Reason the will, or rather the subject of willing, is treated as a special class of representations or objects. But even there we saw this object coinciding with the subject, in other words, ceasing to be object. We then called this coincidence the miracle par excellence to a certain extent the whole of the present work is an explanation of this. In so far as I know my will really as object, I know it as body; but then I am again at the first class of representations laid down in that essay, that is, again at real objects. As we go on, we shall see more and more that the first class of representations finds its explanation, its solution, only in the fourth class enumerated in that essay, which could no longer be properly opposed to the subject as object; and that, accordingly, we must learn to understand the inner nature of the law of causality valid in the first class, and of what happens according to this law, from the law of motivation governing the fourth class.The identity of the will and of the body, provisionally explained, can be demonstrated only as is done here, and that for the first time, and as will be done more and more in the further course of our discussion. In other words, it can be raised from immediate consciousness, from knowledge in the concrete, to rational knowledge of reason, or be carried over into knowledge in the abstract. On the other hand, by its nature it can never be demonstrated, that is to say, deduced as indirect knowledge from some other more direct knowledge, for the very reason that it is itself the most direct knowledge. If we do not apprehend it and stick to it as such, in vain shall we expect to obtain it again in some indirect way as derived knowledge. It is a knowledge of quite a peculiar nature, whose truth cannot therefore really be brought under one of the four headings by which I have divided all truth in the essay On the Principle of Sufficient Reason, § 29, namely, logical, empirical, transcendental, and metalogical. For it is not, like all these, the reference of an abstract representation to another representation, or to the necessary form of intuitive or of abstract representing, but it is the reference of a judgement to the relation that a representation of perception, namely the body, has to that which is not a representation at all, but is toto genere different therefrom, namely will. I should therefore like to distinguish this truth from every other, and call it philosophical truth par excellence. We can turn the expression of this truth in different ways and say: My body and my will are one; or. What as representation of perception I call my body, I call my will in so far as I am conscious of it in an entirely different way comparable with no other; or, My body is the objectivity of my will; or, Apart from the fact that my body is my representation, it is still my will, and so on.
§19.
Whereas in the first book we were reluctantly forced to declare our own body to be mere representation of the knowing subject, like all the other objects of this world of perception, it has now become clear to us that something in the consciousness of everyone distinguishes the representation of his own body from all others that are in other respects quite like it. This is that the body occurs in consciousness in quite another way, toto genere different, that is denoted by the word will. It is just this double knowledge of our own body which gives us information about- that body itself, about its action and movement following on motives, as well as about its suffering through outside impressions, in a word, about what it is, not as representation, but as something over and above this, and hence what it is in itself. We do not have such immediate information about the nature, action, and suffering of any other real objects.
The knowing subject is an individual precisely by reason of this special relation to the one body which, considered apart from this, is for him only a representation like all other representations. But the relation by virtue of which the knowing subject is an individual, subsists for that very reason only between him and one particular representation among all his representations. He is therefore conscious of this particular representation not merely as such, but at the same time in a quite different way, namely as a will. But if he abstracts from that special relation, from that twofold and completely heterogeneous knowledge of one and the same thing, then that one thing, the body, is a representation like all others. Therefore, in order to understand where he is in this matter, the knowing individual must either assume that the distinctive feature of that one representation is to be found merely in the fact that his knowledge stands in this double reference only to that one representation; that only into this one object of perception is an insight in two ways at the same time open to him; and that this is to be explained not by a difference of this object from all others, but only by a difference between the relation of his knowledge to this one object and its relation to all others. Or he must assume that this one object is essentially different from all others; that it alone among all objects is at the same time will and representation, the rest, on the other hand, being mere representation, i.e., mere phantoms. Thus, he must assume that his body is the only real individual in the world, i.e.-, the only phenomenon of will, and the only immediate object of the subject. That the other objects, considered as mere representations, are like his body, in other words, like this body fill space (itself perhaps existing only as representation), and also, like this body, operate in space - this, I say, is demonstrably certain from the law of causality, which is a priori certain for representations, and admits of no effect without a cause. But apart from the fact that we can infer from the effect only a cause in general, not a similar cause, we are still always in the realm of the mere representation, for which alone the law of causality is valid, and beyond which it can never lead us. But whether the objects known to the individual only as representations are yet, like his own body, phenomena of a will, is, as stated in the previous book, the proper meaning of the question as to the reality of the external world. To deny this is the meaning of theoretical egoism, which in this way regards as phantoms all phenomena outside its own will, just as practical egoism does in a practical respect; thus in it a man regards and treats only his own person as a real person, and all others as mere phantoms. Theoretical egoism, of course, can never be refuted by proofs, yet in philosophy it has never been positively used otherwise than as a sceptical sophism, i.e., for the sake of appearance. As a serious conviction, on the other hand, it could be found only in a madhouse; as such it would then need not so much a refutation as a cure. Therefore we do not go into it any further, but regard it as the last stronghold of scepticism, which is always polemical. Thus our knowledge, bound always to individuality and having its limitation in this very fact, necessarily means that everyone can be only one thing, whereas he can know everything else, and it is this very limitation that really creates the need for philosophy. Therefore we, who for this very reason are endeavouring to extend the limits of our knowledge through philosophy, shall regard this sceptical argument of theoretical egoism, which here confronts us, as a small frontier fortress. Admittedly the fortress is impregnable, but the garrison can never sally forth from it, and therefore we can pass it by and leave it in our rear without danger.The double knowledge which we have of the nature and action of our own body, and which is given in two completely different ways, has now been clearly brought out. Accordingly, we shall use it further as a key to the inner being of every phenomenon in nature. We shall judge all objects which are not our own body, and therefore are given to our consciousness not in the double way, but only as representations, according to the analogy of this body. We shall therefore assume that as, on the one hand, they are representation, just like our body, and are in this respect homogeneous with it, so on the other hand, if we set aside their existence as the subject's representation, what still remains over must be, according to its inner nature, the same as what in ourselves we call will. For what other kind of existence or reality could we attribute to the rest of the material world? From what source could we take the elements out of which we construct such a world? Besides the will and the representation, there is absolutely nothing known or conceivable for us. If we wish to attribute the greatest known reality to the material world, which immediately exists only in our representation, then we give it that reality which our own body has for each of us, for to each of us this is the most real of things. But if now we analyse the reality of this body and its actions, then, beyond the fact that it is our representation, we find nothing in it but the will; with this even its reality is exhausted. Therefore we can nowhere find another kind of reality to attribute to the material world. If, therefore, the material world is to be something more than our mere representation, we must say that, besides being the representation, and hence in itself and of its inmost nature, it is what we find immediately in ourselves as will. I say 'of its inmost nature,' but we have first of all to get to know more intimately this inner nature of the will, so that we may know how to distinguish from it what belongs not to it itself, but to its phenomenon, which has many grades. Such, for example, is the circumstance of its being accompanied by knowledge, and the determination by motives which is conditioned by this knowledge. As we proceed, we shall see that this belongs not to the inner nature of the will, but merely to its most distinct phenomenon as animal and human being. Therefore, if I say that the force which attracts a stone to the earth is of its nature, in itself, and apart from all representation, will, then no one will attach to this proposition the absurd meaning that the stone moves itself according to a known motive, because it is thus that the will appears in man.
'Thus we cannot in any way agree with Bacon when he (De Augmentis Scientiarum) thinks that all mechanical and physical movements of bodies ensue only after a preceding perception in these bodies, although a glimmering of truth gave birth even to this false proposition. This is also the case with Kepler's statement, in his essay De Planeta Martis, that the planets must have knowledge in order to keep to their elliptical courses so accurately and to regulate the velocity of their motion, so that the triangles of the plane of their course always remain proportional to the time in which they pass through their bases.
But we will now prove, establish, and develop to its full extent, clearly and in more detail, what has hitherto been explained provisionally and generally.
§20.
As the being-in-itself of our own body, as that which this body is besides being object of perception, namely representation, the will, as we have said, proclaims itself first of all in the voluntary movements of this body, in so far as these movements are nothing but the visibility of the individual acts of the will. These movements appear directly and simultaneously with those acts of will; they are one and the same thing with them, and are distinguished from them only by the form of perceptibility into which they have passed, that is to say, in which they have become representation.
But these acts of the will always have a ground or reason outside themselves in motives. Yet these motives never determine more than what I will at this time, in this place, in these circumstances, not that I will in general, or what I will in general, in other words, the maxim characterising the whole of my willing. Therefore, the whole inner nature of my willing cannot be explained from the motives, but they determine merely its manifestation at a given point of time; they are merely the occasion on which my will shows itself. This will itself, on the other hand, lies outside the province of the law of motivation; only the phenomenon of the will at each point of time is determined by this law. Only on the presupposition of my empirical character is the motive a sufficient ground of explanation of my conduct. But if I abstract from my character, and then ask why in general I will this and not that, no answer is possible, because only the appearance or phenomenon of the will is subject to the principle of sufficient reason, not the will itself, which in this respect may be called groundless. Here I in part presuppose Kant's doctrine of the empirical and intelligible characters, as well as my remarks pertinent to this in the Grundprobleme der Ethik. We shall have to speak about this again in more detail in the fourth book. For the present, I have only to draw attention to the fast that one phenomenon being established by another, as in this case the deed by the motive, does not in the least conflict with the essence-in-itself of the deed being will. The will itself has no ground; the principle of sufficient reason in all its aspects is merely the form of knowledge, and hence its validity extends only to the representation, to the phenomenon, to the visibility of the will, not to the will itself that becomes visible.Now if every action of my body is an appearance or phenomenon of an act of will in which my will itself in general and as a whole, and hence my character, again expresses itself under given motives, then phenomenon or appearance of the will must also be the indispensable condition and presupposition of every action. For the will's appearance cannot depend on something which does not exist directly and only through it, and would therefore be merely accidental for it, whereby the will's appearance itself would be only accidental. But that condition is the whole body itself. Therefore this body itself must be phenomenon of the will, and must be related to my will as a whole, that is to say, to my intelligible character, the phenomenon of which in time is my empirical character, in the same way as the particular action of the body is to the particular act of the will. Therefore the whole body must be nothing but my will become visible, must be my will itself, in so far as this is object of perception, representation of the first class. It has already been advanced in confirmation of this that every impression on my body also affects my will at once and immediately, and in this respect is called pain or pleasure, or in a lower degree, pleasant or unpleasant sensation. Conversely, it has also been advanced that every violent movement of the will, and hence every emotion and passion, convulses the body, and disturbs the course of its functions. Indeed an etiological, though very incomplete, account can be given of the origin of my body, and a somewhat better account of its development and preservation. Indeed this is physiology; but this explains its theme only in exactly the same way as motives explain action. Therefore the establishment of the individual action through the motive, and the necessary sequence of the action from the motive, do not conflict with the fact that action, in general and by its nature, is only phenomenon or appearance of a will that is in itself groundless. Just as little does the physiological explanation of the functions of the body detract from the philosophical truth that the whole existence of this body and the sum-total of its functions are only the objectification of that will which appears in this body's outward actions in accordance with motives. If, however, physiology tries to refer even these outward actions, the immediate voluntary movements, to causes in the organism, for example, to explain the movement of a muscle from an affluxion of humours ("like the contraction of a cord that is wet," as Reil says in the Archiv für Physiologie, Vol. VI, p. 153); supposing that it really did come to a thorough explanation of this kind, this would never do away with the immediately certain truth that every voluntary movement (functiones animales) is phenomenon of an act of will. Now, just as little can the physiological explanation of vegetative life (functiones naturales, vitales), however far it may be developed, ever do away with the truth that this whole animal life, thus developing itself, is phenomenon of the will. Generally then, as already stated, no etiological explanation can ever state more than the necessarily determined position in time and space of a particular phenomenon and its necessary appearance there according to a fixed rule. On the other hand, the inner nature of everything that appears in this way remains for ever unfathomable, and is presupposed by every etiological explanation; it is merely expressed by the name force, or law of nature, or, when we speak of actions, the name character or will. Thus, although every particular action, under the presupposition of the definite character, necessarily ensues with the presented motive, and although growth, the process of nourishment, and all the changes in the animal body take place according to necessarily lasting causes (stimuli), the whole series of actions, and consequently every individual act and likewise its condition, namely the whole body itself which performs it, and therefore also the process through which and in which the body exists, are nothing but the phenomenal appearance of the will, its becoming visible, the objectivity of the will. On this rests the perfect suitability of the human and animal body to the human and animal will in general, resembling, but far surpassing, the suitability of a purposely made instrument to the will of its maker, and on this account appearing as fitness or appropriateness, i.e., the teleological accountability of the body. Therefore the parts of the body must correspond completely to the chief demands and desires by which the will manifests itself; they must be the visible expression of these desires. Teeth, gullet, and intestinal canal are objectified hunger; the genitals are objectified sexual impulse; grasping hands and nimble feet correspond to the more indirect strivings of the will which they represent. Just as the general human form corresponds to the general human will, so to the individually modified will, namely the character of the individual, there corresponds the individual bodily structure, which is therefore as a whole and in all its parts characteristic and full of expression. It is very remarkable that even Parmenides expressed this in the following verses, quoted by Aristotle (Metaphysics):
"Just as everyone possesses the complex of flexible limbs, so does there dwell in men the mind in conformity with this. For everyone mind and complex of limbs are always the same; for intelligence is the criterion."
§21.
From all these considerations the reader has now gained in the abstract, and hence in clear and certain terms, a knowledge which everyone possesses directly in the concrete, namely as feeling. This is the knowledge that the inner nature of his own phenomenon, which manifests itself to him as representation both through his actions and through the permanent substratum of these his body, is his Will. This will constitutes what is most immediate in his consciousness, but as such it has not wholly entered into the form of the representation, in which object and subject stand over against each other; on the contrary, it makes itself known in an immediate way in which subject and object are not quite clearly distinguished, yet it becomes known to the individual himself not as a whole, but only in its particular acts. The reader who with me has gained this conviction, will find that of itself it will become the key to the knowledge of the innermost being of the whole of nature, since he now transfers it to all those phenomena that are given to him, not like his own phenomenon both in direct and in indirect knowledge, but in the latter solely, and hence merely in a one-sided way, as representation alone has received a full and thorough treatment.
Source: http://www.marxists.org/reference/subject/philosophy/works/ge/schopenh.htm