Addition to the Revised Edition (1918).
The view which I have here outlined may be regarded as one to which man is led as it were spontaneously, as soon as he begins to reflect about his relation to the world. He then finds himself caught in a system of thoughts which dissolves for him as fast as he frames it. The thoughts which form this system are such that the purely theoretical refutation of them does not exhaust our task. We have to live through them, in order to understand the confusion into which they lead us, and to find the way out. They must figure in any discussion of the relation of man to the world, not for the sake of refuting others whom one believes to be holding mistaken views about this relation, but because it is necessary to understand the confusion in which all first efforts at reflection about such a relation are apt to issue. One needs to learn by experience how to refute oneself with respect to these first reflections. This is the point of view from which the arguments of the preceding chapter are to be understood.
Whoever tries to work out for himself a theory of the relation of man to the world, becomes aware of the fact that he creates this relation, at least in part, by forming ideas about the things and events in the world. In consequence, his attention is deflected from what exists outside in the world and directed towards his inner world, the realm of his ideas. He begins to say to himself, It is impossible for me to stand in relation to any thing or event, unless an idea appears in me. From this fact, once noticed, it is but a step to the theory: all that I experience is only my ideas; of the existence of a world outside I know only in so far as it is an idea in me. With this theory, man abandons the standpoint of Naïve Realism which he occupies prior to all reflection about his relation to the world. So long as he stands there, he believes that he is dealing with real things, but reflection about himself drives him away from this position. Reflection does not reveal to his gaze a real world such as naïve consciousness claims to have before it. Reflection reveals to him only his ideas; they interpose themselves between his own nature and a supposedly real world, such as the naïve point of view confidently affirms. The interposition of the world of ideas prevents man from perceiving any longer such a real world. He must suppose that he is blind to such a reality. Thus arises the concept of a “thing-in-itself” which is inaccessible to knowledge. So long as we consider only the relation to the world into which man appears to enter through the stream of his ideas, we can hardly avoid framing this type of theory. Yet we cannot remain at the point of view of Naïve Realism except at the price of closing our minds artificially to the desire for knowledge. The existence of this desire for knowledge about the relation of man to the world proves that the naïve point of view must be abandoned. If the naïve point of view yielded anything which we could acknowledge as truth, we could not experience this desire. But mere abandonment of the naïve point of view does not lead to any other view which we could regard as true, so long as we retain, without noticing it, the type of theory which the naïve point of view imposes on us. This is the mistake made by the man who says, I experience only my ideas, and though I think that I am dealing with real things, I am actually conscious of nothing but my ideas of real things. I must, therefore, suppose that genuine realities, “things-in-themselves,” exist only outside the boundary of my consciousness; that they are inaccessible to my immediate knowledge; but that they somehow come into contact with me and influence me so as to make a world of ideas arise in me. Whoever thinks thus, duplicates in thought the world before him by adding another. But, strictly he ought to begin his whole theorising over again with regard to this second world. For the unknown “thing-in-itself,” in its relation to man’s own nature, is conceived in exactly the same way as is the known thing of the naïvely realistic point of view. There is only one way of escaping from the confusion into which one falls, by critical reflection on this naïve point of view. This is to observe that, at the very heart of everything we can experience, be it within the mind or outside in the world of perception, there is something which does not share the fate of an idea interposing itself between the real event and the contemplating mind. This something is thinking. With regard to thinking we can maintain the point of view of Naïve Realism. If we mistakenly abandon it, it is only because we have learnt that we must abandon it for other mental activities, but overlook that what we have found to be true for other activities, does not apply to thinking. When we realise this, we gain access to the further insight that, in thinking and through thinking, man necessarily comes to know the very thing to which he appears to blind himself by interposing between the world and himself the stream of his ideas. A critic highly esteemed by the author of this book has objected that this discussion of thinking stops at a naïvely realistic theory of thinking, as shown by the fact that the real world and the world of ideas are held to be identical. However, the author believes himself to have shown in this very discussion that the validity of “Naïve Realism,” as applied to thinking, results inevitably from an unprejudiced study of thinking; and that Naïve Realism, in so far as it is invalid for other mental activities, is overcome through the recognition of the true nature of thinking.
[1] Knowledge is transcendental when it is aware that nothing can be asserted directly about the thing-in-itself but makes indirect inferences from the subjective which is known to the unknown which lies beyond the subjective (transcendental). The thing-in-itself is, according to this view, beyond the sphere of the world of immediate experience; in other words, it is transcendent. Our world can, however, be transcendentally related to the transcendent. Hartmann’s theory is called Realism because it proceeds from the subjective, the mental, to the transcendent, the real. [↑]
VI
HUMAN INDIVIDUALITY
Philosophers have found the chief difficulty in the explanation of ideas in the fact that we are not identical with the external objects, and yet our ideas must have a form corresponding to their objects. But on closer inspection it turns out that this difficulty does not really exist. We certainly are not identical with the external things, but we belong together with them to one and the same world. The stream of the universal cosmic process passes through that segment of the world which, to my perception, is myself as subject. So far as my perception goes, I am, in the first instance, confined within the limits bounded by my skin. But all that is contained within the skin belongs to the cosmos as a whole. Hence, for a relation to subsist between my organism and an object external to me, it is by no means necessary that something of the object should slip into me, or make an impression on my mind, like a signet-ring on wax. The question, How do I gain knowledge of that tree ten feet away from me, is utterly misleading. It springs from the view that the boundaries of my body are absolute barriers, through which information about external things filters into me. The forces which are active within my body are the same as those which exist outside. I am, therefore, really identical with the objects; not, however, I in so far as I am subject of perception, but I in so far as I am a part within the universal cosmic process. The percept of the tree belongs to the same whole as my Self. The universal cosmic process produces alike, here the percept of the tree, and there the percept of my Self. Were I a world-creator instead of a world-knower, subject and object (percept and self) would originate in one act. For they condition one another reciprocally. As world-knower I can discover the common element in both, so far as they are complementary aspects of the world, only through thought which by means of concepts relates the one to the other.
The most difficult to drive from the field are the so-called physiological proofs of the subjectivity of our percepts. When I exert pressure on the skin of my body, I experience it as a pressure sensation. This same pressure can be sensed as light by the eye, as sound by the ear. I experience an electrical shock by the eye as light, by the ear as sound, by the nerves of the skin as touch, and by the nose as a smell of phosphorus. What follows from these facts? Only this: I experience an electrical shock, or, as the case may be, a pressure followed by a light, or a sound, or, it may be, a certain smell, etc. If there were no eye present, then no light quality would accompany the perception of the mechanical vibrations in my environment; without the presence of the ear, no sound, etc. But what right have we to say that in the absence of sense-organs the whole process would not exist at all? All those who, from the fact that an electrical process causes a sensation of light in the eye, conclude that what we sense as light is only a mechanical process of motion, forget that they are only arguing from one percept to another, and not at all to something altogether transcending percepts. Just as we can say that the eye perceives a mechanical process of motion in its surroundings as light, so we can affirm that every change in an object, determined by natural law, is perceived by us as a process of motion. If I draw twelve pictures of a horse on the circumference of a rotating disc, reproducing exactly the positions which the horse’s body successively assumes in movement, I can, by rotating the disc, produce the illusion of movement. I need only look through an opening in such a way that, at regular intervals, I perceive the successive positions of the horse. I perceive, not separate pictures of twelve horses, but one picture of a single galloping horse.
The above-mentioned physiological facts cannot, therefore, throw any light on the relation of percept to idea. Hence, we must seek a relation some other way.
The moment a percept appears in my field of consciousness, thought, too, becomes active in me. A member of my thought-system, a definite intuition, a concept, connects itself with the percept. When, next, the percept disappears from my field of vision, what remains? The intuition, with the reference to the particular percept which it acquired in the moment of perception. The degree of vividness with which I can subsequently recall this reference depends on the manner in which my mental and bodily organism is working. An idea is nothing but an intuition related to a particular percept; it is a concept which was once connected with a certain percept, and which retains this reference to the percept. My concept of a lion is not constructed out of my percepts of a lion; but my idea of a lion is formed under the guidance of the percepts. I can teach someone to form the concept of a lion without his ever having seen a lion, but I can never give him a living idea of it without the help of his own perception.
An idea is therefore nothing but an individualised concept. And now we can see how real objects can be represented to us by ideas. The full reality of a thing is present to us in the moment of observation through the combination of concept and percept. The concept acquires by means of the percept an individualised form, a relation to this particular percept. In this individualised form which carries with it, as an essential feature, the reference to the percept, it continues to exist in us and constitutes the idea of the thing in question. If we come across a second thing with which the same concept connects itself, we recognise the second as being of the same kind as the first; if we come across the same thing twice, we find in our conceptual system, not merely a corresponding concept, but the individualised concept with its characteristic relation to this same object, and thus we recognise the object again.
The idea, then, stands between the percept and the concept. It is the determinate concept which points to the percept.
The sum of my ideas may be called my experience. The man who has the greater number of individualised concepts will be the man of richer experience. A man who lacks all power of intuition is not capable of acquiring experience. The objects simply disappear again from the field of his consciousness, because he lacks the concepts which he ought to bring into relation with them. On the other hand, a man whose faculty of thought is well developed, but whose perception functions badly owing to his clumsy sense-organs, will be no better able to gain experience. He can, it is true, by one means and another acquire concepts; but the living reference to particular objects is lacking to his intuitions. The unthinking traveller and the student absorbed in abstract conceptual systems are alike incapable of acquiring a rich experience.
Reality presents itself to us as the union of percept and concept; and the subjective representation of this reality presents itself to us as idea.
If our personality expressed itself only in cognition, the totality of all that is objective would be contained in percept, concept and idea.
However, we are not satisfied merely to refer percepts, by means of thinking, to concepts, but we relate them also to our private subjectivity, our individual Ego. The expression of this relation to us as individuals is feeling, which manifests itself as pleasure and pain.
Thinking and feeling correspond to the two-fold nature of our being to which reference has already been made. By means of thought we take an active part in the universal cosmic process. By means of feeling we withdraw ourselves into the narrow precincts of our own being.
Thought links us to the world; feeling leads us back into ourselves and thus makes us individuals. Were we merely thinking and perceiving beings, our whole life would flow along in monotonous indifference. Could we only know ourselves as Selves, we should be totally indifferent to ourselves. It is only because with self-knowledge we experience self-feeling, and with the perception of objects pleasure and pain, that we live as individuals whose existence is not exhausted by the conceptual relations in which they stand to the rest of the world, but who have a special value in themselves.
One might be tempted to regard the life of feeling as something more richly saturated with reality than the apprehension of the world by thought. But the reply to this is that the life of feeling, after all, has this richer meaning only for my individual self. For the universe as a whole my feelings can be of value only if, as percepts of myself, they enter into connection with a concept and in this roundabout way become links in the cosmos.
Our life is a continual oscillation between our share in the universal world-process and our own individual existence. The farther we ascend into the universal nature of thought where the individual, at last, interests us only as an example, an instance, of the concept, the more the character of something individual, of the quite determinate, unique personality, becomes lost in us. The farther we descend into the depths of our own private life and allow the vibrations of our feelings to accompany all our experiences of the outer world, the more we cut ourselves off from the universal life. True individuality belongs to him whose feelings reach up to the farthest possible extent into the region of the ideal. There are men in whom even the most general ideas still bear that peculiar personal tinge which shows unmistakably their connection with their author. There are others whose concepts come before us as devoid of any trace of individual colouring as if they had not been produced by a being of flesh and blood at all.
Even ideas give to our conceptual life an individual stamp. Each one of us has his special standpoint from which he looks out on the world. His concepts link themselves to his percepts. He has his own special way of forming general concepts. This special character results for each of us from his special standpoint in the world, from the way in which the range of his percepts is dependent on the place in the whole where he exists. The conditions of individuality here indicated, we call the milieu.
This special character of our experience must be distinguished from another which depends on our peculiar organisation. Each of us, as we know, is organised as a unique, fully determined individual. Each of us combines special feelings, and these in the most varying degrees of intensity, with his percepts. This is just the individual element in the personality of each of us. It is what remains over when we have allowed fully for all the determining factors in our milieu.
A life of feeling, wholly devoid of thought, would gradually lose all connection with the world. But man is meant to be a whole, and knowledge of objects will go hand-in-hand for him with the development and education of the feeling-side of his nature.
Feeling is the means whereby, in the first instance, concepts gain concrete life.
VII
ARE THERE ANY LIMITS TO KNOWLEDGE?
We have established that the elements for the explanation of reality are to be taken from the two spheres of perception and thought. It is due, as we have seen, to our organisation that the full totality of reality, including our own selves as subjects, appears at first as a duality. Knowledge transcends this duality by fusing the two elements of reality, the percept and the concept, into the complete thing. Let us call the manner in which the world presents itself to us, before by means of knowledge it has taken on its true nature, “the world of appearance,” in distinction from the unified whole composed of percept and concept. We can then say, The world is given to us as a duality (Dualism), and knowledge transforms it into a unity (Monism). A philosophy which starts from this basal principle may be called a Monistic philosophy, or Monism. Opposed to this is the theory of two worlds, or Dualism. The latter does not, by any means, assume merely that there are two sides of a single reality, which are kept apart by our organisation, but that there are two worlds totally distinct from one another. It then tries to find in one of these two worlds the principle of explanation for the other.
Dualism rests on a false conception of what we call knowledge. It divides the whole of reality into two spheres, each of which has its own laws, and it leaves these two worlds standing outside one another.
It is from a Dualism such as this that there arises the distinction between the object of perception and the thing-in-itself, which Kant introduced into philosophy, and which, to the present day, we have not succeeded in expelling. According to our interpretation, it is due to the nature of our organisation that a particular object can be given to us only as a percept. Thought transcends this particularity by assigning to each percept its proper place in the world as a whole. As long as we determine the separate parts of the cosmos as percepts, we are simply following, in this sorting out, a law of our subjective constitution. If, however, we regard all percepts, taken together, merely as one part, and contrast with this a second part, viz., the things-in-themselves, then our philosophy is building castles-in-the-air. We are then engaged in mere playing with concepts. We construct an artificial opposition, but we can find no content for the second of these opposites, seeing that no content for a particular thing can be found except in perception.
Every kind of reality which is assumed to exist outside the sphere of perception and conception must be relegated to the limbo of unverified hypotheses. To this category belongs the “thing-in-itself.” It is, of course, quite natural that a Dualistic thinker should be unable to find the connection between the world-principle which he hypothetically assumes and the facts that are given in experience. For the hypothetical world-principle itself a content can be found only by borrowing it from experience and shutting one’s eyes to the fact of the borrowing. Otherwise it remains an empty and meaningless concept, a mere form without content. In this case the Dualistic thinker generally asserts that the content of this concept is inaccessible to our knowledge. We can know only that such a content exists, but not what it is. In either case it is impossible to transcend Dualism. Even though one were to import a few abstract elements from the world of experience into the content of the thing-in-itself, it would still remain impossible to reduce the rich concrete life of experience to those few elements, which are, after all, themselves taken from experience. Du Bois-Reymond lays it down that the imperceptible atoms of matter produce sensation and feeling by means of their position and motion, and then infers from this premise that we can never find a satisfactory explanation of how matter and motion produce sensation and feeling, for “it is absolutely and for ever unintelligible that it should be other than indifferent to a number of atoms of carbon, hydrogen, and nitrogen, etc., how they lie and move, how they lay or moved, or how they will lie and will move. It is in no way intelligible how consciousness can come into existence through their interaction.” This conclusion is characteristic of the whole tendency of this school of thought. Position and motion are abstracted from the rich world of percepts. They are then transferred to the fictitious world of atoms. And then we are astonished that we fail to evolve concrete life out of this principle of our own making, which we have borrowed from the world of percepts.
That the Dualist, working as he does with a completely empty concept of the thing-in-itself, can reach no explanation of the world, follows from the very definition of his principle which has been given above.
In any case, the Dualist finds it necessary to set impassable barriers to our faculty of knowledge. A follower of the Monistic theory of the world knows that all he needs to explain any given phenomenon in the world is to be found within this world itself. What prevents him from finding it can be only chance limitations in space and time, or defects of his organisation, i.e., not of human organisation in general, but only of his own.
It follows from the concept of knowledge, as defined by us, that there can be no talk of any limits of knowledge. Knowledge is not a concern of the universe in general, but one which men must settle for themselves. External things demand no explanation. They exist and act on one another according to laws which thought can discover. They exist in indivisible unity with these laws. But we, in our self-hood, confront them, grasping at first only what we have called percepts. However, within ourselves we find the power to discover also the other part of reality. Only when the Self has combined for itself the two elements of reality which are indivisibly bound up with one another in the world, is our thirst for knowledge stilled. The Self is then again in contact with reality.
The presuppositions for the development of knowledge thus exist through and for the Self. It is the Self which sets itself the problems of knowledge. It takes them from thought, an element which in itself is absolutely clear and transparent. If we set ourselves questions which we cannot answer, it must be because the content of the questions is not in all respects clear and distinct. It is not the world which sets questions to us, but we who set them to ourselves.
I can imagine that it would be quite impossible for me to answer a question which I happened to find written down somewhere, without knowing the universe of discourse from which the content of the question is taken.
In knowledge we are concerned with questions which arise for us through the fact that a world of percepts, conditioned by time, space, and our subjective organisation, stands over against a world of concepts expressing the totality of the universe. Our task consists in the assimilation to one another of these two spheres, with both of which we are familiar. There is no room here for talking about limits of knowledge. It may be that, at a particular moment, this or that remains unexplained because, through chance obstacles, we are prevented from perceiving the things involved. What is not found to-day, however, may easily be found to-morrow. The limits due to these causes are only contingent, and must be overcome by the progress of perception and thought.
Dualism makes the mistake of transferring the opposition of subject and object, which has meaning only within the perceptual world, to pure conceptual entities outside this world. Now the distinct and separate things in the perceptual world remain separated only so long as the perceiver refrains from thinking. For thought cancels all separation and reveals it as due to purely subjective conditions. The Dualist, therefore, transfers to entities transcending the perceptual world abstract determinations which, even in the perceptual world, have no absolute, but only relative, validity. He thus divides the two factors concerned in the process of knowledge, viz., percept and concept, into four: (1) the object in itself; (2) the percept which the subject has of the object; (3) the subject; (4) the concept which relates the percept to the object in itself. The relation between subject and object is “real”; the subject is really (dynamically) influenced by the object. This real process does not appear in consciousness. But it evokes in the subject a response to the stimulation from the object. The result of this response is the percept. This, at length, appears in consciousness. The object has an objective (independent of the subject) reality, the percept a subjective reality. This subjective reality is referred by the subject to the object. This reference is an ideal one. Dualism thus divides the process of knowledge into two parts. The one part, viz., the production of the perceptual object by the thing-in-itself, he conceives of as taking place outside consciousness, whereas the other, the combination of percept with concept and the latter’s reference to the thing-in-itself, takes place, according to him, in consciousness.
With such presuppositions, it is clear why the Dualist regards his concepts merely as subjective representations of what is really external to his consciousness. The objectively real process in the subject by means of which the percept is produced, and still more the objective relations between things-in-themselves, remain for the Dualist inaccessible to direct knowledge. According to him, man can get only conceptual representations of the objectively real. The bond of unity which connects things-in-themselves with one another, and also objectively with the individual minds (as things-in-themselves) of each of us, exists beyond our consciousness in a Divine Being of whom, once more, we have merely a conceptual representation.
The Dualist believes that the whole world would be dissolved into a mere abstract scheme of concepts, did he not posit the existence of real connections beside the conceptual ones. In other words, the ideal principles which thinking discovers are too airy for the Dualist, and he seeks, in addition, real principles with which to support them.
Let us examine these real principles a little more closely. The naïve man (Naïve Realist) regards the objects of sense-experience as realities. The fact that his hands can grasp, and his eyes see, these objects is for him sufficient guarantee of their reality. “Nothing exists that cannot be perceived” is, in fact, the first axiom of the naïve man; and it is held to be equally valid in its converse: “Everything which is perceived exists.” The best proof for this assertion is the naïve man’s belief in immortality and in ghosts. He thinks of the soul as a fine kind of matter perceptible by the senses which, in special circumstances, may actually become visible to the ordinary man (belief in ghosts).
In contrast with this, his real, world, the Naïve Realist regards everything else, especially the world of ideas, as unreal, or “merely ideal.” What we add to objects by thinking is merely thoughts about the objects. Thought adds nothing real to the percept.
But it is not only with reference to the existence of things that the naïve man regards perception as the sole guarantee of reality, but also with reference to the existence of processes. A thing, according to him, can act on another only when a force actually present to perception issues from the one and acts upon the other. The older physicists thought that very fine kinds of substances emanate from the objects and penetrate through the sense-organs into the soul. The actual perception of these substances is impossible only because of the coarseness of our sense-organs relatively to the fineness of these substances. In principle, the reason for attributing reality to these substances was the same as that for attributing it to the objects of the sensible world, viz., their kind of existence, which was conceived to be analogous to that of perceptual reality.
The self-contained being of ideas is not thought of by the naïve mind as real in the same sense. An object conceived “merely in idea” is regarded as a chimera until sense-perception can furnish proof of its reality. In short, the naïve man demands, in addition to the ideal evidence of his thinking, the real evidence of his senses. In this need of the naïve man lies the ground for the origin of the belief in revelation. The God whom we apprehend by thought remains always merely our idea of God. The naïve consciousness demands that God should manifest Himself in ways accessible to the senses. God must appear in the flesh, and must attest his Godhead to our senses by the changing of water into wine.
Even knowledge itself is conceived by the naïve mind as a process analogous to sense-perception. Things, it is thought, make an impression on the mind, or send out copies of themselves which enter through our senses, etc.
What the naïve man can perceive with his senses he regards as real, and what he cannot perceive (God, soul, knowledge, etc.) he regards as analogous to what he can perceive.
On the basis of Naïve Realism, science can consist only in an exact description of the content of perception. Concepts are only means to this end. They exist to provide ideal counterparts of percepts. With the things themselves they have nothing to do. For the Naïve Realist only the individual tulips, which we can see, are real. The universal idea of tulip is to him an abstraction, the unreal thought-picture which the mind constructs for itself out of the characteristics common to all tulips.
Naïve Realism, with its fundamental principle of the reality of all percepts, contradicts experience, which teaches us that the content of percepts is of a transitory nature. The tulip I see is real to-day; in a year it will have vanished into nothingness. What persists is the species “tulip.” This species is, however, for the Naïve Realist merely an idea, not a reality. Thus this theory of the world finds itself in the paradoxical position of seeing its realities arise and perish, while that which, by contrast with its realities, it regards as unreal endures. Hence Naïve Realism is compelled to acknowledge the existence of something ideal by the side of percepts. It must include within itself entities which cannot be perceived by the senses. In admitting them, it escapes contradicting itself by conceiving their existence as analogous to that of objects of sense. Such hypothetical realities are the invisible forces by means of which the objects of sense-perception act on one another. Another such reality is heredity, the effects of which survive the individual, and which is the reason why from the individual a new being develops which is similar to it, and by means of which the species is maintained. The soul, the life-principle permeating the organic body, is another such reality which the naïve mind is always found conceiving in analogy to realities of sense-perception. And, lastly, the Divine Being, as conceived by the naïve mind, is such a hypothetical entity. The Deity is thought of as acting in a manner exactly corresponding to that which we can perceive in man himself, i.e., the Deity is conceived anthropomorphically.
Modern Physics traces sensations back to the movements of the smallest particles of bodies and of an infinitely fine substance, called ether. What we experience, e.g., as warmth is a movement of the parts of a body which causes the warmth in the space occupied by that body. Here again something imperceptible is conceived on the analogy of what is perceptible. Thus, in terms of perception, the analogon to the concept “body” is, say, the interior of a room, shut in on all sides, in which elastic balls are moving in all directions, impinging one on another, bouncing on and off the walls, etc.
Without such assumptions the world of the Naïve Realist would collapse into a disconnected chaos of percepts, without mutual relations, and having no unity within itself. It is clear, however, that Naïve Realism can make these assumptions only by contradicting itself. If it would remain true to its fundamental principle, that only what is perceived is real, then it ought not to assume a reality where it perceives nothing. The imperceptible forces of which perceptible things are the bearers are, in fact, illegitimate hypotheses from the standpoint of Naïve Realism. But because Naïve Realism knows no other realities, it invests its hypothetical forces with perceptual content. It thus transfers a form of existence (the existence of percepts) to a sphere where the only means of making any assertion concerning such existence, viz., sense-perception, is lacking.
This self-contradictory theory leads to Metaphysical Realism. The latter constructs, beside the perceptible reality, an imperceptible one which it conceives on the analogy of the former. Metaphysical Realism is, therefore, of necessity Dualistic.
Wherever the Metaphysical Realist observes a relation between perceptible things (mutual approach through movement, the entrance of an object into consciousness, etc.), there he posits a reality. However, the relation of which he becomes aware cannot be perceived but only expressed by means of thought. The ideal relation is thereupon arbitrarily assimilated to something perceptible. Thus, according to this theory, the world is composed of the objects of perception which are in ceaseless flux, arising and disappearing, and of imperceptible forces by which the perceptible objects are produced, and which are permanent.
Metaphysical Realism is a self-contradictory mixture of Naïve Realism and Idealism. Its forces are imperceptible entities endowed with the qualities proper to percepts. The Metaphysical Realist has made up his mind to acknowledge in addition to the sphere for the existence of which he has an instrument of knowledge in sense-perception, the existence of another sphere for which this instrument fails, and which can be known only by means of thought. But he cannot make up his mind at the same time to acknowledge that the mode of existence which thought reveals, viz., the concept (or idea), has equal rights with percepts. If we are to avoid the contradiction of imperceptible percepts, we must admit that, for us, the relations which thought traces between percepts can have no other mode of existence than that of concepts. If one rejects the untenable part of Metaphysical Realism, there remains the concept of the world as the aggregate of percepts and their conceptual (ideal) relations. Metaphysical Realism, then, merges itself in a view of the world according to which the principle of perceptibility holds for percepts, and that of conceivability for the relations between the percepts. This view of the world has no room, in addition to the perceptual and conceptual worlds, for a third sphere in which both principles, the so-called “real” principle and the “ideal” principle, are simultaneously valid.
When the Metaphysical Realist asserts that, beside the ideal relation between the perceived object and the perceiving subject, there must be a real relation between the percept as “thing-in-itself” and the subject as “thing-in-itself” (the so-called individual mind), he is basing his assertion on the false assumption of a real process, imperceptible but analogous to the processes in the world of percepts. Further, when the Metaphysical Realist asserts that we stand in a conscious ideal relation to our world of percepts, but that to the real world we can have only a dynamic (force) relation, he repeats the mistake we have already criticised. We can talk of a dynamic relation only within the world of percepts (in the sphere of the sense of touch), but not outside that world.
Let us call the view which we have just characterised, and into which Metaphysical Realism merges when it discards its contradictory elements, Monism, because it combines one-sided Realism and Idealism into a higher unity.
For Naïve Realism, the real world is an aggregate of percepts; for Metaphysical Realism, reality belongs not only to percepts but also to imperceptible forces; Monism replaces forces by ideal relations which are supplied by thought. These relations are the laws of nature. A law of nature is nothing but the conceptual expression for the connection of certain percepts.
Monism is never called upon to ask whether there are any principles of explanation for reality other than percepts and concepts. The Monist knows that in the whole realm of the real there is no occasion for this question. In the perceptual world, as immediately apprehended, he sees one-half of reality; in the union of this world with the world of concepts he finds full reality. The Metaphysical Realist might object that, relatively to our organisation, our knowledge may be complete in itself, that no part may be lacking, but that we do not know how the world appears to a mind organised differently from our own. To this the Monist will reply, Maybe there are intelligences other than human; and maybe also that their percepts are different from ours, if they have perception at all. But this is irrelevant to me for the following reasons. Through my perceptions, i.e., through this specifically human mode of perception, I, as subject, am confronted with the object. The nexus of things is thereby broken. The subject reconstructs the nexus by means of thought. In doing so it re-inserts itself into the context of the world as a whole. As it is only through the Self, as subject, that the whole appears rent in two between percept and concept, the reunion of those two factors will give us complete knowledge. For beings with a different perceptual world (e.g., if they had twice our number of sense-organs) the nexus would appear broken in another place, and the reconstruction would accordingly have to take a form specifically adapted to such beings. The question concerning the limits of knowledge troubles only Naïve and Metaphysical Realism, both of which see in the contents of mind only ideal representations of the real world. For, to these theories, whatever falls outside the subject is something absolute, a self-contained whole, and the subject’s mental content is a copy which is wholly external to this absolute. The completeness of knowledge depends on the greater or lesser degree of resemblance between the representation and the absolute object. A being with fewer senses than man will perceive less of the world, one with more senses will perceive more. The former’s knowledge will, therefore, be less complete than the latter’s.
For Monism, the situation is different. The point where the unity of the world appears to be rent asunder into subject and object depends on the organisation of the percipient. The object is not absolute but merely relative to the nature of the subject. The bridging of the gap, therefore, can take place only in the quite specific way which is characteristic of the human subject. As soon as the Self, which in perception is set over against the world, is again re-inserted into the world-nexus by constructive thought, all further questioning ceases, having been but a result of the separation.
A differently constituted being would have a differently constituted knowledge. Our own knowledge suffices to answer the questions which result from our own mental constitution.
Metaphysical Realism must ask, What is it that gives us our percepts? What is it that stimulates the subject?
Monism holds that percepts are determined by the subject. But in thought the subject has, at the same time, the instrument for transcending this determination of which it is itself the author.
The Metaphysical Realist is faced by a further difficulty when he seeks to explain the similarity of the world-views of different human individuals. He has to ask himself, How is it that my theory of the world, built up out of subjectively determined percepts and out of concepts, turns out to be the same as that which another individual is also building up out of these same two subjective factors? How, in any case, is it possible for me to argue from my own subjective view of the world to that of another human being? The Metaphysical Realist thinks he can infer the similarity of the subjective world-views of different human beings from their ability to get on with one another in practical life. From this similarity of world-views he infers further the likeness to one another of individual minds, meaning by “individual mind” the “I-in-itself” underlying each subject.
We have here an inference from a number of effects to the character of the underlying causes. We believe that after we have observed a sufficiently large number of instances, we know the connection sufficiently to know how the inferred causes will act in other instances. Such an inference is called an inductive inference. We shall be obliged to modify its results, if further observation yields some unexpected fact, because the character of our conclusion is, after all, determined only by the particular details of our actual observations. The Metaphysical Realist asserts that this knowledge of causes, though restricted by these conditions, is quite sufficient for practical life.
Inductive inference is the fundamental method of modern Metaphysical Realism. At one time it was thought that out of concepts we could evolve something that would no longer be a concept. It was thought that the metaphysical reals, which Metaphysical Realism after all requires, could be known by means of concepts. This method of philosophising is now out of date. Instead it is thought that from a sufficiently large number of perceptual facts we can infer the character of the thing-in-itself which lies behind these facts. Formerly it was from concepts, now it is from percepts, that the Realist seeks to evolve the metaphysically real. Because concepts are before the mind in transparent clearness, it was thought that we might deduce from them the metaphysically real with absolute certainty. Percepts are not given with the same transparent clearness. Each fresh one is a little different from others of the same kind which preceded it. In principle, therefore, anything inferred from past experience is somewhat modified by each subsequent experience. The character of the metaphysically real thus obtained can therefore be only relatively true, for it is open to correction by further instances. The character of Von Hartmann’s Metaphysics depends on this methodological principle. The motto on the title-page of his first important book is, “Speculative results gained by the inductive method of Science.”
The form which the Metaphysical Realist at the present day gives to his things-in-themselves is obtained by inductive inferences. Consideration of the process of knowledge has convinced him of the existence of an objectively-real world-nexus, over and above the subjective world which we know by means of percepts and concepts. The nature of this reality he thinks he can determine by inductive inferences from his percepts.