Thought generally is simple, universal self-identity, but in the form of negative movement, whereby the determinate abrogates itself. This movement of Being-for-self is now an essential moment of thought, while hitherto it was outside it; and thus grasping itself as movement in itself, thought is self-consciousness—at first indeed formal, as individual self-consciousness. Such a form it has in scepticism, but this distinction marks it off from the older scepticism, that now the certainty of reality is made the starting point. With the ancients, on the contrary, scepticism is the return into individual consciousness in such a way that to it this consciousness is not the truth, in other words that scepticism does not give expression to the results arrived at, and attains no positive significance. But since in the modern world this absolute substantiality, this unity of implicitude and self-consciousness is fundamental—that is, this faith in reality generally—scepticism has here the form of idealism, i.e. of expressing self-consciousness or certainty of self as all reality and truth. The crudest form of this idealism is when self-consciousness, as individual or formal, does not proceed further than to say: All objects are our conceptions. We find this subjective idealism in Berkeley,[279] and another form of the same in Hume.
This idealism, in which all external reality disappears, has before it the standpoint of Locke, and it proceeds directly from him. For we saw that to Locke the source of truth is experience, or Being as perceived. Now since this sensuous Being, as Being, has in it the quality of being for consciousness, we saw that it necessarily came to pass that in Locke’s case some qualities, at least, were so determined that they were not in themselves, but only for another; and that colour, figure, &c., had their ground only in the subject, in his particular organization. This Being-for-another, however, was not by him accepted as the Notion, but as falling within self-consciousness—i.e. self-consciousness not looked on as universal,—not within mind, but within what is opposed to the implicit.
George Berkeley was born in 1684 at Kilcrin, near Thomastown, in the county of Kilkenny, Ireland: in 1754 he died as an English Bishop.[280] He wrote the “Theory of Vision,” 1709; “A Treatise concerning the principles of human knowledge,” 1710; “Three Dialogues between Hylas and Philonous,” 1713. In 1784 his collected works were published in London in two quarto volumes.
Berkeley advocated an idealism which came very near to that of Malebranche. As against the metaphysic of the understanding, we have the point of view that all existence and its determinations arise from feeling, and are constituted by self-consciousness. Berkeley’s first and fundamental thought is consequently this: “The Being of whatever is called by us a thing consists alone in its being perceived,” i.e. our determinations are the objects of our knowledge. “All objects of human knowledge are ideas” (so called by Berkeley as by Locke), “which arise either from the impressions of the outward senses, or from perceptions of the inward states and activities of the mind, or finally, they are such as are constituted by means of memory and imagination through their separation and rearrangement. A union of different sensuous feelings appears to us to be a particular thing, e.g. the feeling of colour, taste, smell, figure, &c.; for by colours, smells, sounds, something of which we have a sensation is always understood.”[281] This is the matter and the object of knowledge; the knower is the percipient “I,” which reveals itself in relation to those feelings in various activities, such as imagination, remembrance, and will.
Berkeley thus indeed acknowledges the distinction between Being-for-self and Other-Being, which in his case, however, itself falls within the “I.” Of the matter on which activity is directed, it is no doubt in regard to one portion allowed that it does not exist outside of mind—that is to say, so far as our thoughts, inward feelings and states, or the operations of our imaginary powers are concerned. But in like manner the manifold sensuous conceptions and feelings can only exist in a mind. Locke certainly distinguished extension and movement, for example, as fundamental qualities, i.e. as qualities which pertain to the objects in themselves. But Berkeley very pertinently points out inconsistency here from the point of view that great and small, quick and slow, hold good as something relative; thus were extension and movement to be inherent or implicit, they could not be either large or small, quick or slow; that is, they could not be, for these determinations rest in the conception[282] of such qualities. In Berkeley the relation of things to consciousness is alone dealt with, and beyond this relationship they do not in his view come. From this it follows that it is only self-consciousness that possesses them; for a perception which is not in a conceiving mind is nothing: it is a direct contradiction. There can be no substance, he says, which neither conceives nor perceives, and which is yet the substratum of perceptions and conceptions. If it is represented that there is something outside of consciousness which is similar to the conceptions, this is likewise contradictory; a conception can alone be similar to a conception, the idea to the idea alone.[283]
Thus, while Locke’s ultimate point is abstract substance, Being generally with the real determination of a substratum of accidents, Berkeley declares this substance to be the most incomprehensible assumption of all; but the incomprehensibility does not make this Being into an absolute nullity, nor does it make it in itself incomprehensible.[284] For Berkeley brings forward against the present existence of external objects only the inconceivability of the relation of a Being to mind. This inconceivability, however, is destroyed in the Notion, for the Notion is the negative of things; and this moved Berkeley and Leibnitz to shut up the two sides in themselves. There nevertheless remains a relationship of what is “other” to us; these feelings do not develop from us as Leibnitz represents, but are determined through somewhat else. When Leibnitz speaks of development within the monads, it is nothing but empty talk; for the monads as they follow in succession have no inward connection. Each individual is thus determined through another, and not through us; and it does not matter what this external is, since it remains a contingent. Now in relation to the two sides of Leibnitz which are indifferent to one another, Berkeley says that such an “other” is quite superfluous. Berkeley calls the other the objects; but these, he says, cannot be what we call matter, for spirit and matter cannot come together.[285] But the necessity of conceptions directly contradicts this Being-within-self of the conceiver; for the Being-within-self is the freedom of the conceiver; the latter does not, however, produce the conceptions with freedom; they have for him the form and determinateness of an independent “other.” Berkeley likewise does not accept idealism in the subjective sense, but only in respect that there are spirits which impart themselves (in the other case the subject forms his own conceptions), and consequently that it is God alone who brings to pass such conceptions; thus the imaginations or conceptions which are produced by us with our individual activity remain separate from these others,[286] i.e. from the implicit.
This conception gives an instance of the difficulties which appear in regard to these questions, and which Berkeley wished to escape from in a quite original way. The inconsistency in this system God has again to make good; He has to bear it all away; to Him the solution of the contradiction is left. In this idealism, in short, the common sensuous view of the universe and the separation of actuality, as also the system of thought, of judgments devoid of Notion, remain exactly as before; plainly nothing in the content is altered but the abstract form that all things are perceptions only.[287] Such idealism deals with the opposition between consciousness and its object merely, and leaves the extension of the conceptions and the antagonisms of the empirical and manifold content quite untouched; and if we ask what then is the truth of these perceptions and conceptions, as we asked formerly of things, no answer is forthcoming. It is pretty much a matter of indifference whether we believe in things or in perceptions, if self-consciousness remains possessed entirely by finalities; it receives the content in the ordinary way, and that content is of the ordinary kind. In its individuality it stumbles about amid the conceptions of an entirely empirical existence, without knowing and understanding anything else about the content: that is to say in this formal idealism reason has no content of its own.
As to what Berkeley further states in respect of the empirical content, where the object of his investigation becomes entirely psychological, it relates in the main to finding out the difference between the sensations of sight and feeling, and to discovering which kind of sensations belong to the one and which to the other. This kind of investigation keeps entirely to the phenomenal, and only therein distinguishes the various sorts of phenomena; or comprehension only reaches as far as to distinctions. The only point of interest is that these investigations have in their course chiefly lighted on space, and a dispute is carried on as to whether we obtain the conception of distance and so on, in short all the conceptions relating to space, through sight or feeling. Space is just this sensuous universal, the universal in individuality itself, which in the empirical consideration of empirical multiplicity invites and leads us on to thought (for it itself is thought), and by it this very sensuous perception and reasoning respecting perception is in its action confused. And since here perception finds an objective thought, it really would be led on to thought or to the possession of a thought, but at the same time it cannot arrive at thought in its completion, since thought or the Notion are not in question, and it clearly cannot come to the consciousness of true reality. Nothing is thought in the form of thought, but only as an external, as something foreign to thought.
We must add to what has preceded an account of the Scepticism of Hume, which has been given a more important place in history than it deserves from its intrinsic nature; its historic importance is due to the fact that Kant really derives the starting point of his philosophy from Hume.
David Hume was born in 1711 at Edinburgh and died there in 1776. He held a librarian’s post in that town for some time, then he became secretary to the Embassy in Paris; for quite a long period, indeed, he moved in diplomatic circles. In Paris he came to know Jean Jacques Rousseau and invited him to England, but Rousseau’s terribly distrustful and suspicious nature very soon estranged the two.[288] Hume is more celebrated as a writer of history than through his philosophic works. He wrote: “A Treatise of human nature,” 3 vols., 1739, translated into German by Jacob, Halle, 1790, 8vo; likewise “Essays and Treatises on several subjects,” 2 vols. (Vol. I. containing “Essays moral, political and literary,” printed for the first time in Edinburgh, 1742; Vol. II. containing an “Inquiry concerning human understanding,” a further development of the Treatise, and first printed separately in London, 1748, 8vo). In his “Essays,” which contributed most to his fame as far as the philosophic side is concerned, he treated philosophic subjects as an educated, thoughtful man of the world would do—not in a systematic connection, nor showing the wide range which his thoughts should properly have been able to attain; in fact in some of his treatises he merely dealt with particular points of view.
We must shortly deal with the main aspects of Hume’s philosophy. He starts directly from the philosophic standpoint of Locke and Bacon, which derives our conceptions from experience, and his scepticism has the idealism of Berkeley as its object. The sequence of thought is this: Berkeley allows all ideas to hold good as they are; in Hume the antithesis of the sensuous and universal has cleared and more sharply defined itself, sense being pronounced by him to be devoid of universality. Berkeley does not make any distinction as to whether in his sensations there is a necessary connection or not. Formerly experience was a mixture of the two elements. Hume tells us that all perceptions of the mind may be divided into two classes or species, that of impressions, i.e. sensuous perceptions, and thoughts or ideas; the latter are similar in content to the former, but less forcible and lively. All objects of reason are consequently either relations of thoughts such as mathematical axioms, or facts of experience.[289] Since Hume makes these into the content he naturally rejects innate ideas.[290]
Now when Hume goes on to consider more closely what is subsumed under experience, he finds categories of the understanding present there, and more especially the determination of the universal and of universal necessity; he took under his consideration more particularly the category of cause and effect, and in it set forth the rational element, inasmuch as in this causal relationship necessity is especially contained. Here Hume really completed the system of Locke, since he consistently drew attention to the fact that if this point of view be adhered to, experience is indeed the principle of whatever one knows, or perception itself contains everything that happens, but nevertheless the determination of universality and necessity are not contained in, nor were they given us by experience. Hume has thus destroyed the objectivity or absolute nature of thought-determinations. “Our conviction of the truth of a fact rests on feeling, memory, and the reasonings founded on the causal connection, i.e. on the relation of cause and effect. The knowledge of this relation is not attained by reasonings a priori, but arises entirely from experience; and we draw inferences, since we expect similar results to follow from similar causes, by reason of the principle of the custom or habit of conjoining different manifestations, i.e. by reason of the principle of the association of ideas. Hence there is no knowledge and no metaphysics beyond experience.”[291]
The simple thought we have here is exactly what Locke says, that we must receive the conception of cause and effect, and thus of a necessary connection, from experience; but experience, as sensuous perception, contains no necessity, has no causal connection. For in what we term such, that which we properly speaking perceive is merely the fact that something first of all happens and that then something else follows. Immediate perception relates only to a content of conditions or things which are present alongside of and in succession to one another, but not to what we call cause and effect; in time-succession there is thus no relation of cause and effect, and consequently no necessity either.[292] When we say the pressure of the water is the cause of the destruction of this house, that is no pure experience. We have merely seen the water pressing or moving along in this direction, and subsequently the house falling down; and so with other examples. Necessity is thus not justified by experience, but we carry it into experience; it is accidentally arrived at by us and is subjective merely. This kind of universality which we connect with necessity, Hume calls custom. Because we have often seen results to follow we are accustomed to regard the connection as a necessary one; the necessity to him is thus a quite contingent association of ideas, which is custom.
It is the same thing in respect of the universal. What we perceive are individual phenomena and sensations in which we see that this is now one thing and now another. It may likewise be that we perceive the same determination frequently repeated and in manifold ways. But this is still far removed from universality; universality is a determination which is not given to us through experience. It may be said that this is quite a correct remark on Hume’s part, if by experience we understand outward experience. Experience is sensible that something exists, but nevertheless the universal is not as yet present in it. Indeed, sensuous existence as such is something which is set forth as indifferent, not differentiated from anything else; but sensuous existence is likewise universal in itself, or the indifference of its determinateness is not its only determinateness. But since Hume regards necessity, the unity of opposites, as resting quite subjectively on custom, we cannot get any deeper in thought. Custom is indeed so far a necessity in consciousness, and to this extent we really see the principle of this idealism in it; but in the second place this necessity is represented as something quite devoid of thought or Notion.
This custom obtains both in our perception which relates to sensuous nature, and in relation to law and morality. The ideas of justice and morality rest upon an instinct, on a subjective, but very often deceptive moral feeling.[293] From a sceptical point of view the opposite may likewise be demonstrated. From this side Hume considers justice, morality, religious determinations, and disputes their absolute validity. That is to say when it is assumed that our knowledge arises from experience, and that we must consider only what we obtain thereby to be the truth, we find indeed in our feeling, the sentiment e.g. that the murderer, the thief, &c., must be punished; and because this is likewise felt by others it is universally allowed. But Hume, like the sceptics of former days, appeals to the various opinions of various nations: amongst different nations and in different times various standards of right have been held.[294] There are those who in this case do not have the feeling of wrong-doing in respect of stealing, e.g. the Lacedæmonians or the so-called innocent inhabitants of the South Sea Islands. What is by one nation called immoral, shameful and irreligious, is by another not considered so at all. Thus because such matters rest upon experience, one subject has such and such an experience, finds, for instance, in his religious feelings this determination which inclines him to God, while another subject has different experiences altogether. We are in the habit of allowing one thing to be just and moral, others have another mode of regarding it. Hence if the truth depends upon experience, the element of universality, of objectivity, &c., comes from elsewhere, or is not justified by experience. Hume thus declared this sort of universality, as he declared necessity, to be rather subjectively than objectively existent; for custom is just a subjective universality of this kind. This is an important and acute observation in relation to experience looked at as the source of knowledge; and it is from this point that the Kantian reflection now begins.
Hume (Essays and Treatises on several subjects, Vol. III. Sect. 8, 11) then extended his scepticism to the conceptions and doctrines of freedom and necessity, and to the proofs of the existence of God; and in fact scepticism here possesses a wide field. To such a system of reasoning from thoughts and possibilities another method of reasoning may again be opposed, and this reasoning is no better than the other. What is said to be metaphysically established regarding immortality, God, nature, &c., lacks a real ground for resting upon, such as is professed to be given; for the inferences on which men ground their proofs are subjectively formed conceptions. But where a universality is found, it does not rest in the matter in itself, but is simply a subjective necessity which is really mere custom. Hence the result which Hume arrives at is necessarily astonishment regarding the condition of human knowledge, a general state of mistrust, and a sceptical indecision—which indeed does not amount to much. The condition of human knowledge regarding which Hume so much wonders, he further describes as containing an antagonism between reason and instinct; this instinct, it is said, which embraces many sorts of powers, inclinations, &c., deceives us in many different ways, and reason demonstrates this. But on the other side it is empty, without content or principles of its own; and if a content is in question at all, it must keep to those inclinations. In itself reason thus has no criterion whereby the antagonism between individual desires, and between itself and the desires, may be settled.[295] Thus everything appears in the form of an irrational existence devoid of thought; the implicitly true and right is not in thought, but in the form of an instinct, a desire.