b. From these external perceptions of objects presently existing, with which we here began, the affections, the internal perceptions, which give the criteria for practical life are however distinguished; they are of two kinds, either pleasant or unpleasant. That is to say, they have as their content pleasure or satisfaction, and pain: the first, as that which peculiarly belongs to the perceiver, is the positive; but pain, as something alien to him, is the negative. It is these sensuous perceptions which determine action; they are the material from which general conceptions regarding what causes me pain or pleasure are formed; as being permanent they are therefore again conceptions, and opinion is again this reference of conception to perception, according to which I pass judgment on objects—affections, desires, and so on.[152] It is by this opinion, therefore, that the decision to do or to avoid anything is arrived at.
This constitutes the whole Canon of Epicurus, the universal standard of truth; it is so simple that nothing can well be simpler, and yet it is very abstract. It consists of ordinary psychological conceptions which are correct on the whole, but quite superficial; it is the mechanical view of conception having respect to the first beginnings of observation. But beyond this there lies another and quite different sphere, a field that contains determinations in themselves; and these are the criteria by which the statements of Epicurus must be judged. Nowadays even Sceptics are fond of speaking of facts of consciousness; this sort of talk goes no further than the Epicurean Canon.
2. METAPHYSICS.
2. METAPHYSICS.
In the second place, Epicurus enters on a metaphysical explanation of how we are related to the object; for sensuous perception and outside impressions he unhesitatingly regards as our relation to external things, so that he places the conceptions in me, the objects outside of me. In raising the question of how we come by our conceptions, there lies a double question: on the one hand, since sense-perceptions are not like conceptions, but require an external object, what is the objective manner in which the images of external things enter into us? On the other hand, it may be asked how conceptions of such things as are not matter of perception arise in us; this seems to be an activity of thought, which derives conceptions such as these from other conceptions; we shall, however, see presently (pp. 287, 288) and more in detail, how the soul, which is here related to the object in independent activity, arrives at such a point.
“From the surfaces of things,” says Epicurus in the first place, “there passes off a constant stream, which cannot be detected by our senses” (for things would in any other case decrease in size) and which is very fine; “and this because, by reason of the counteracting replenishment, the thing itself in its solidity long preserves the same arrangement and disposition of the atoms; and the motion through the air of these surfaces which detach themselves is of the utmost rapidity, because it is not necessary that what is detached should have any thickness;” it is only a surface. Epicurus says, “Such a conception does not contradict our senses, when we take into consideration how pictures produce their effects in a very similar way, I mean by bringing us into sympathy with external things. Therefore emanations, like pictures, pass out from them into us, so that we see and know the forms and colours of things.”[153] This is a very trivial way of representing sense-perception. Epicurus took for himself the easiest criterion of the truth that is not seen, a criterion still in use, namely that it is not contradicted by what we see or hear. For in truth such matters of thought as atoms, the detachment of surfaces, and so forth, are beyond our powers of sight. Certainly we manage to see and to hear something different; but there is abundance of room for what is seen and what is conceived or imagined to exist alongside of one another. If the two are allowed to fall apart, they do not contradict each other; for it is not until we relate them that the contradiction becomes apparent.
“Error,” as Epicurus goes on to say on the second point “comes to pass when, through the movement that takes place within us on the conception therein wrought, such a change is effected that the conception can no longer obtain for itself the testimony of perception. There would be no truth, no likeness of our perceptions, which we receive as in pictures or in dreams or in any other way, if there were nothing on which we, as it were, put out our faculty of observation. There would be no untruth if we did not receive into ourselves another movement, which, to be sure, is conformable to the entering in of the conception, but which has at the same time an interruption.”[154] Error is therefore, according to Epicurus, only a displacement of the pictures in us, which does not proceed from the movement of perception, but rather from this, that we check their influence by a movement originating in ourselves; how this interruption is brought about will be shown more fully later on (pp. 290, 300).
The Epicurean theory of knowledge reduces itself to these few passages, some of which are also obscurely expressed, or else not very happily selected or quoted by Diogenes Laërtius; it is impossible to have a theory less explicitly stated. Knowledge, on the side of thought, is determined merely as a particular movement which makes an interruption; and as Epicurus, as we have already seen, looks on things as made up of a multitude of atoms, thought is the moment which is different from the atoms, the vacuum, the pores, whereby resistance to this stream of atoms is rendered possible. If this negative is also again, as soul, affirmative, Epicurus in the notional determination of thinking has only reached this negativity, that we look away from something, _i.e._ we interrupt that inflowing stream. The answer to the question of what this interrupting movement exactly is, when taken for itself, is connected with the more advanced conceptions of Epicurus; and in order to discuss them more in detail, we must go back to the implicit basis of his system.
This constitutes on the whole the metaphysic of Epicurus; in it he has expounded his doctrine of the atom, but not with greater definiteness than did Leucippus and Democritus. The essence and the truth of things were to him, as they were to them, atoms and vacuum: “Atoms have no properties except figure, weight and magnitude.” Atoms, as atoms, must remain undetermined; but the Atomists have been forced to take the inconsistent course of ascribing properties to them: the quantitative properties of magnitude and figure, the qualitative property of weight. But that which is in itself altogether indivisible can have neither figure nor magnitude; and even weight, direction upon something else, is opposed to the abstract repulsion of the atom. Epicurus even says: “Every property is liable to change, but the atoms change not. In all dissolutions of the composite, something must remain a constant and indissoluble, which no change can transform into that which is not, or bring from non-being into Being. This unchangeable element, therefore, is constituted by some bodies and figures. The properties are a certain relation of atoms to each other.”[155] In like manner we have already seen with Aristotle (p. 178) that the tangible is the foundation of properties: a distinction which under various forms is still always made and is in common use. We mean by this that an opposition is established between fundamental properties, such as we here have in weight, figure and magnitude, and sensuous properties, which are only in relation to us, and are derived from the former original differences. This has frequently been understood as if weight were in things, while the other properties were only in our senses: but, in general, the former is the moment of the implicit, or the abstract essence of the thing, while the latter is its concrete existence, which expresses its relation to other things.
The important matter now would be to indicate the relation of atoms to sensuous appearance, to allow essence to pass over into the negative: but here Epicurus rambles amidst the indeterminate which expresses nothing; for we perceive in him, as in the other physicists, nothing but an unconscious medley of abstract ideas and realities. All particular forms, all objects, light, colour, &c., the soul itself even, are nothing but a certain arrangement of these atoms. This is what Locke also said, and even now Physical Science declares that the basis of things is found in molecules, which are arranged in a certain manner in space. But these are empty words, and a crystal, for instance, is not a certain arrangement of parts, which gives this figure. It is thus not worth while to deal with this relation of atoms; for it is an altogether formal way of speaking, as when Epicurus again concedes that figure and magnitude, in so far as pertaining to atoms, are something different from what they are as they appear in things. The two are not altogether unlike; the one, implicit magnitude, has something in common with apparent magnitude. The latter is transitory, variable; the former has no interrupted parts,[156] that is, nothing negative. But the determination of the atoms, as originally formed in this or that fashion, and having original magnitude of such and such a kind, is a purely arbitrary invention. That interruption, which we regarded above (p. 288) as the other side to atoms, or as vacuum, is the principle of movement: for the movement of thought is also like this and has interruptions. Thought in man is the very same as atoms and vacuum are in things, namely their inward essence; that is to say, atoms and vacuum belong to the movement of thought, or exist for this in the same way as things are in their essential nature. The movement of thinking is thus the province of the atoms of the soul; so that there takes place simultaneously therein an interruption of the inward flow of atoms from without. There is therefore nothing further to be seen in this than the general principle of the positive and negative, so that even thought is affected by a negative principle, the moment of interruption. This principle of the Epicurean system, further applied to the difference in things, is the most arbitrary and therefore the most wearisome that can be imagined.
Besides their different figures, atoms have also, as the fundamental mode in which they are affected, a difference of movement, caused by their weight; but this movement to some extent deviates from the straight line in its direction. That is to say, Epicurus ascribes to atoms a curvilinear movement, in order that they may impinge on one another and so on.[157] In this way there arise particular accumulations and configurations; and these are things.
Other physical properties, such as taste and smell, have their basis again in another arrangement of the molecules. But there is no bridge from this to that, or what results is simply empty tautology, according to which the parts are arranged and combined as is requisite in order that their appearance may be what it is. The transition to bodies of concrete appearance Epicurus has either not made at all, or what has been cited from him as far as this matter is concerned, taken by itself, is extremely meagre.
The opinion that one hears expressed respecting the Epicurean philosophy is in other respects not unfavourable; and for this reason some further details must be given regarding it. For since absolute Being is constituted by atoms scattered and disintegrated, and by vacuum, it directly follows that Epicurus denies to these atoms any relationship to one another which implies purpose. All that we call forms and organisms, or generally speaking, the unity of Nature’s end, in his way of thinking, belongs to qualities, to an external connection of the configurations of the atoms, which in this way is merely an accident, brought about by their chance-directed motion; the atoms accordingly form a merely superficial unity, and one which is not essential to them. Or else Epicurus altogether denies that Notion and the Universal are the essential, and because all originations are to him chance combinations, for him their resolution is just as much a matter of chance. The divided is the first and the truly existent, but at the same time chance or external necessity is the law which dominates all cohesion. That Epicurus should in this fashion declare himself against a universal end in the world, against every relation of purpose—as, for instance, the inherent conformity to purpose of the organism—and, further, against the teleological representations of the wisdom of a Creator in the world, his government, &c., is a matter of course; for he abrogates unity, whatever be the manner in which we represent it, whether as Nature’s end in itself, or as end which is in another, but is carried out in Nature. In contrast to this, the teleological view enters largely into the philosophy of the Stoics, and is there very fully developed. To show that conformity to an end is lacking, Epicurus brings forward the most trivial examples; for instance, that worms and so on are produced by chance from mud through the warmth of the sun. Taken in their entirety, they may very well be the work of chance in relation to others; but what is implicit in them, their Notion and essence is something organic: and the comprehension of this is what we have now to consider. But Epicurus banishes thought as implicit, without its occurring to him that his atoms themselves have this very nature of thought; that is, their existence in time is not immediate but essentially mediate, and thus negative or universal;—the first and only inconsistency that we find in Epicurus, and one which all empiricists are guilty of. The Stoics take the opposite course of finding essential Being in the object of thought or the universal; and they fail equally in reaching the content, temporal existence, which, however, they most inconsistently assume. We have here the metaphysics of Epicurus; nothing that he says farther on this head is of interest.
3. PHYSICS.
The natural philosophy of Epicurus is based on the above foundation; but an aspect of interest is given it by the fact that it is still peculiarly the method of our times; his thoughts on particular aspects of Nature are, however, in themselves feeble and of little weight, containing nothing but an ill-considered medley of all manner of loose conceptions. Going further, the principle of the manner in which Epicurus looks on nature, lies in the conceptions he forms, which we have already had before us (pp. 282, 285). That is to say, the general representations which we receive through the repetition of several perceptions, and to which we relate such perceptions in forming an opinion, must be then applied to that which is not exactly matter of perception, but yet has something in common with what we can perceive. In this way it comes about that by such images we can apprehend the unknown which does not lend itself immediately to perception; for from what is known we must argue to what is unknown. This is nothing else but saying that Epicurus judged by analogy, or that he makes so-called evidence the principle of his view of Nature; and this is the principle which to this day has authority in ordinary physical science. We go through experiences and make observations, these arising from the sensuous perceptions which are apt to be overlooked. Thus we reach general concepts, laws, forces, and so on, electricity and magnetism, for instance, and these are then applied by us to such objects and activities as we cannot ourselves directly perceive. As an example, we know about the nerves and their connection with the brain; in order that there may be feeling and so on, it is said that a transmission from the finger-tips to the brain takes place. But how can we represent this to ourselves? We cannot make it a matter of observation. By anatomy we can lay bare the nerves, it is true, but not the manner of their working. We represent these to ourselves on the analogy of other phenomena of transmission, for instance as the vibration of a tense string that passes through the nerves to the brain. As in the well-known phenomenon of a number of billiard balls set close together in a row, the last of which rolls away when the first is struck, while those in the middle, through each of which the effect of the stroke has been communicated to the next, scarcely seem to move, so we represent to ourselves the nerves as consisting of tiny balls which are invisible even through the strongest magnifying glass, and fancy that at every touch, &c., the last springs off and strikes the soul. In the same way light is represented as filaments, rays, or as vibrations of the ether, or as globules of ether, each of which strikes on the other. This is an analogy quite in the manner of Epicurus.
In giving such explanations as those above, Epicurus professed to be most liberal, fair and tolerant, saying that all the different conceptions which occur to us in relation to sensuous objects—at our pleasure, we may say,—can be referred to that which we cannot ourselves directly observe; we should not assert any one way to be the right one, for many ways may be so. In so saying, Epicurus is talking idly; his words fall on the ear and the fancy, but looked on more narrowly they disappear. So, for instance, we see the moon shine, without being able to have any nearer experience of it. On this subject Epicurus says: “The moon may have its own light, or a light borrowed from the sun; for even on earth we see things which shine of themselves, and many which are illuminated by others. Nothing hinders us from observing heavenly things in the light of various previous experiences, and from adopting hypotheses and explanations in accordance with these. The waxing and waning of the moon may also be caused by the revolution of this body, or through changes in the air” (according as vapour is modified in one way or another), “or also by means of adding and taking away somewhat: in short, in all the ways whereby that which has a certain appearance to us is caused to show such appearance.” Thus there are to be found in Epicurus all these trivialities of friction, concussion, &c., as when he gives his opinion of lightning on the analogy of how we see fire of other kinds kindled: “Lightning is explained by quite a large number of possible conceptions; for instance, that through the friction and collision of clouds the figuration of fire is emitted, and lightning is produced.” In precisely the same way modern physicists transfer the production of an electric spark, when glass and silk are rubbed against each other, to the clouds. For, as we see a spark both in lightning and electricity, we conclude from this circumstance common to both that the two are analogical; therefore, we come to the conclusion that lightning also is an electric phenomenon. But clouds are not hard bodies, and by moisture electricity is more likely to be dispersed; therefore, such talk has just as little truth in it as the fancy of Epicurus. He goes on to say: “Or lightning may also be produced by being expelled from the clouds by means of the airy bodies which form lightning—by being struck out when the clouds are pressed together either by each other or by the wind,” &c. With the Stoics things are not much better. Application of sensuous conceptions according to analogy is often termed comprehension or explanation, but in reality there is in such a process not the faintest approach to thought or comprehension. “One man,” adds Epicurus, “may select; one of these modes, and reject the others, not considering what is possible for man to know, and what is impossible, and therefore striving to attain to a knowledge of the unknowable.”[158] This application of sensuous images to what has a certain similarity to them, is pronounced to be the basis and the knowledge of the cause, because, in his opinion, a transference such as this cannot be corroborated by the testimony of mere immediate sensation; thus the Stoic method of seeking a basis in thought is excluded, and in this respect the mode of explanation adopted by Epicurus is directly opposed to that of the Stoics. One circumstance which strikes us at once in Epicurus is the lack of observation and experience with regard to the mutual relations of bodies: but the kernel of the matter, the principle, is nothing else than the principle of modern physics. This method of Epicurus has been attacked and derided, but on this score no one need be ashamed of or fight shy of it, if he is a physicist; for what Epicurus says is not a whit worse than what the moderns assert. Indeed, in the case of Epicurus the satisfactory assurance is likewise always present of his emphasizing the fact most strongly that just because the evidence of the senses is found to be lacking, we must not take our stand on any one analogy. Elsewhere he in the same way makes light of analogy, and when one person accepts this possibility and another that other possibility, he admires the cleverness of the second and troubles himself little about the explanation given by the first; it may be so, or it may not be so.[159] This is a method devoid of reason, which reaches no further than to general conceptions. Nevertheless, if Physical Science is considered to relate to immediate experience on the one hand, and, on the other hand—in respect of that which cannot be immediately experienced—to relate to the application of the above according to a resemblance existing between it and that which is not matter of experience, in that case Epicurus may well be looked on as the chief promoter, if not the originator of this method, and also as having asserted that it is identical with knowledge. Of the Epicurean method in philosophy we may say this, that it likewise has a side on which it possesses value, and we may in some measure assent when we hear, as we frequently do, the Epicurean physics favourably spoken of. Aristotle and the earlier philosophers took their start in natural philosophy from universal thought _a priori_, and from this developed the Notion; this is the one side. The other side, which is just as necessary, demands that experience should be worked up into universality, that laws should be found out; that is to say, that the result which follows from the abstract Idea should coincide with the general conception to which experience and observation have led up. The _a priori_ is with Aristotle, for instance, most excellent but not sufficient, because to it there is lacking connection with and relation to experience and observation. This leading up of the particular to the universal is the finding out of laws, natural forces, and so on. It may thus be said that Epicurus is the inventor of empiric Natural Science, of empiric Psychology. In contrast to the Stoic ends, conceptions of the understanding, experience is the present as it appears to the senses: there we have abstract limited understanding, without truth in itself, and therefore without the present in time and the reality of Nature; here we have this sense of Nature, which is more true than these other hypotheses.
The same effect which followed the rise of a knowledge of natural laws, &c., in the modern world was produced by the Epicurean philosophy in its own sphere, that is to say, in so far as it is directed against the arbitrary invention of causes. The more, in later times, men made acquaintance with the laws of Nature, the more superstition, miracles, astrology, &c. disappeared; all this fades away owing to the contradiction offered to it by the knowledge of natural laws. The method of Epicurus was directed more especially against the senseless superstition of astrology, &c., in whose methods there is neither reason nor thought, for it is quite a thing of the imagination, downright fabrication being resorted to, or what we may even term lying. In contrast with this, the way in which Epicurus works, when the conceptions and not thought are concerned, accords with truth. For it does not go beyond what is perceived by the sight, and hearing, and the other senses, but keeps to what is present and not alien to the mind, not speaking of certain things as if they could be seen and heard, when that is quite impossible, seeing that the things are pure inventions. The effect of the Epicurean philosophy in its own time was therefore this, that it set itself against the superstition of the Greeks and Romans, and elevated men above it.[160] All the nonsense about birds flying to right or to left, or a hare running across the path, or men deciding how they are to act according to the entrails of animals, or according as chickens are lively or dull—all that kind of superstition the Epicurean philosophy made short work of, by permitting that only to be accepted as truth which is counted as true by sense perception through the instrumentality of anticipations; and from it more than anything those conceptions which have altogether denied the supersensuous have proceeded. The physics of Epicurus were therefore famous for the reason that they introduced more enlightened views in regard to what is physical, and banished the fear of the gods. Superstition passes straightway from immediate appearances to God, angels, demons; or it expects from finite things other effects than the conditions admit of, phenomena of a higher kind. To this the Epicurean natural philosophy is utterly opposed, because in the sphere of the finite it refuses to go beyond the finite, and admits finite causes alone; for the so-called enlightenment is the fact of remaining in the sphere of the finite. There connection is sought for in other finite things, in conditions which are themselves conditioned; superstition, on the contrary, rightly or wrongly, passes at once to what is above us. However correct the Epicurean method may be in the sphere of the conditioned, it is not so in other spheres. Thus if I say that electricity comes from God, I am right and yet wrong. For if I ask for a cause in this same sphere of the conditioned, and give God as answer, I say too much; though this answer fits all questions, since God is the cause of everything, what I would know here is the particular connection of the phenomenon. On the other hand, in this sphere even the Notion is already something higher; but this loftier way of looking at things which we met with in the earlier philosophers, was quite put an end to by Epicurus, since with superstition there also passed away self-dependent connection and the world of the Ideal.
To the natural philosophy of Epicurus there also belongs his conception of the soul, which he looks on as having the nature of a thing, just as the theories of our own day regard it as nerve-filaments, cords in tension, or rows of minute balls (p. 294). His description of the soul has therefore but little meaning, since here also he draws his conclusion by analogy, and connects therewith the metaphysical theory of atoms: “The soul consists of the finest and roundest atoms, which are something quite different from fire, being a fine spirit which is distributed through the whole aggregate of the body, and partakes of its warmth.” Epicurus has consequently established a quantitative difference only, since these finest atoms are surrounded by a mass of coarser atoms and dispersed through this larger aggregate. “The part which is devoid of reason is dispersed in the body” as the principle of life, “but the self-conscious part (τὸ λογικόν) is in the breast, as may be perceived from joy and sadness. The soul is capable of much change in itself, owing to the fineness of its parts, which can move very rapidly: it sympathizes with the rest of the aggregate, as we see by the thoughts, emotions and so on; but when it is taken away from us we die. But the soul, on its part, has also the greatest sympathy with sensuous perception; yet it would have nothing in common with it, were it not in a certain measure covered by the rest of the aggregate” (the body)—an utterly illogical conception. “The rest of this aggregate, which this principle provides for the soul, is thereby also partaker, on its part, of a like condition” (sensuous perception), “yet not of all that the former possesses; therefore, when the soul escapes, sensuous perception exists no more for it. The aggregate spoken of above has not this power in itself, but derives it from the other which is brought into union with it, and the sentient movement comes to pass through the flow of sympathy which they have in common.”[161] Of such conceptions it is impossible to make anything. The above-mentioned (p. 287) interruption of the streaming together of images of external things with our organs, as the ground of error, is now explained by the theory that the soul consists of peculiar atoms, and the atoms are separated from one another by vacuum. With such empty words and meaningless conceptions we shall no longer detain ourselves; we can have no respect for the philosophic thoughts of Epicurus, or rather he has no thoughts for us to respect.