The sensuous world is nothing but a chain of appearances connected according to universal laws; it has therefore no subsistence by itself; it is not the thing in itself, and consequently must point to that which contains the basis of this experience, to beings which cannot be known merely as phenomena, but as things in themselves. These cannot be shown or inferred from concepts. See Notes above for details on copyright and editing. (p. 581b) ], 8 [Empirical judgments (emfiirische Urtheile) are either mere statements of fact, viz.. records of a perception, or statements of a natural law, implying a causal connection between two facts. This faculty is called reason, and, so far as we consider a being (man) entirely according to this objectively determinable reason, he cannot be considered as a being of sense, but this property is that of a thing in itself, of which we cannot comprehend the possibility-I mean how the ought (which however has never yet taken place) should determine its activity, and can become the cause of actions, whose effect is an appearance in the sensible world. I, on the contrary, prove in the first place, that space (and also time, which Berkeley did not consider) and all its determinations a priori, can be known by us, because, no less than time, it inheres in our sensibility as a pure form before all perception or experience and makes all intuition of the same, and therefore all its phenomena, possible. Who can satisfy himself with mere empirical knowledge in all the cosmological questions of the duration and of the quantity of the world, of freedom or of natural necessity, since every answer given on principles of experience begets a fresh question, which likewise requires its answer and thereby clearly shows the insufficiency of all physical modes of explanation to satisfy reason? Sect. Conversely, the synthetic method starts from the unknown and penetrates by degrees until it reaches a system of knowledge that is based on reason. Appearances are related to experience in general as being possible, actual, or necessary. For in all bounds there is something positive (e.g., a surface is the boundary of corporeal space, and is therefore itself a space, a line is a space, which is the boundary of the surface, a point the boundary of the line, but yet always a place in space), whereas limits contain mere negations. Let the concepts of substance and of accident be ever so well dissected and determined, all this is very well as a preparation for some future use. Without some such deduction its truth may be granted, but its existence could by no means be understood, and we must assume II that everything which can be given to our senses (to the external senses in space, to the internal one in time) is intuitd by us as it appears to us, not as it is in itself.". The nature of reason is that it wants to go beyond appearances and wants to know the basis of appearances. iii. But the concept of relation in this case is a mere category, viz., the concept of cause, which has nothing to do with sensibility. (Kant did not describe the Prolegomena this way himself). Time and space are mere forms of our sense intuition and are not qualities of things in themselves apart from our sensuous intuition. A judgment which seeks all that is characteristic of my book, first supposed to be metaphysically heterodox, in a mere innovation of the nomenclature, proves clearly that my would-be judge has understood nothing of the subject, and in addition, has not understood himself. By means of external experience I am conscious of the actuality of bodies, as external phenomena in space, in the same manner as by means of the internal experience I am conscious of the existence of my soul in time, but this soul is only known as an object of the internal sense by phenomena that constitute an internal state, and of which the essence in itself, which forms the basis of these phenomena, is unknown. And thus the problem in our second question, "How is the pure Science of Nature possible?" Few writers are gifted with the subtlety, and at the same time with the grace, of David Hume, or with the depth, as well as the elegance, of Moses Mendelssohn. Such concept cannot be given in any experience, be it ever so extensive, and consequently the falsehood either of the positive or the negative proposition cannot be discovered by this touchstone. Its boundary must lie quite without it, and this field is that of the pure beings of the understanding. We know only appearances, not things in themselves. But as we can never know these beings of understanding as they are in themselves, that is, definitely, yet must assume them as regards the sensible world, and connect them with it by reason, we are at least able to think this connection by means of such concepts as express their relation to the world of sense. Kant’s Critique of Pure Reason Philosophy 270 Prof. B. Whereas the concepts of reason aim at the completeness, i.e., the collective unity of all possible experience, and thereby transcend every given experience. They must wait till those who endeavor to draw from the fountain of reason itself have completed their work; it will then be the historian's turn to inform the world of what has been done. Answering the Question: What Is Enlightenment? What is to be done, then, until it be found, when works of this kind have to be judged of? Other sciences and branches of knowledge have their standard. Postulates of Empirical Thinking generally. These rules, so far as they represent the union as necessary, are rules a priori, and so far as they cannot be deduced from higher rules, are fundamental principles. Ever since I have come to know critique, whenever I finish reading a book of metaphysical contents, which, by the preciseness of its notions, by variety, order, and an easy style, was not only entertaining but also helpful, I cannot help asking, 11 Has this author indeed advanced metaphysics a single step?" Our reason must stay within the boundary of appearances but it assumes that there can be knowledge of the things–in–themselves that exist beyond that boundary. If space is considered to be the mere form of sensibility, the propositions of geometry can be known a priori concerning all objects of external intuition. Our pure concepts of the understanding are not derived from experience and they also contain strict necessity, which experience never attains. Thus we have fully exhibited metaphysics as 'it is actually given in the natural predisposition of human reason, and in that which constitutes the essential end of its pursuit, according to its subjective possibility. § 29. For the question now is, What is the attitude of our reason in this connection of what we know with what we do not, and never shall, know? And conversely when we have reason to consider a judgment necessarily universal (which never depends upon perception, but upon the pure concept of the understanding, under which the perception is subsumed), we must consider it objective also, that is, that it expresses not merely a reference of our perception to a subject, but a quality of the object. The theological Idea is an hypothesis that was made in order to satisfy reason. Our critical deduction by no means excludes things of that sort (noumena), but rather limits the principles of the Aesthetic (the science of the sensibility) to this, that they shall not extend to all things, as everything would then be turned into mere appearance, but that they shall only hold good of objects of possible experience. They therefore only serve to determine empirical judgments, which are otherwise undetermined and indifferent as regards all functions of judging, relatively to these functions, thereby procuring them universal validity, and by means of them making judgments of experience in general possible. I desire therefore that I and everybody else should always connect necessarily the same perceptions under the same circumstances. Idealism consists in the assertion, that there are none but thinking beings, all other things, which we think are perceived in intuition, being nothing but representations in the thinking beings, to which no object external to them corresponds in fact. This in fact is true of plane figures in geometry; but some spherical figures exhibit, notwithstanding a complete internal agreement, such a contrast in their external relation, that the one figure cannot possibly be put in the place of the other. In order to strengthen morality, reason has a tendency to be unsatisfied with physical explanations that relate only to nature and the sensible world. I think plurality merely without universality, and not the exception from universality. For the question now is, "How is it possible to intuit [in a visual form] anything a priori" An intuition [viz., a visual sense perception] is such a representation as immediately depends upon the presence of the object. In this way all mystical idealism falls to the ground, for (as may be seen already in Plato) it inferred from our cognitions a priori (even from those of geometry) another intuition different from that of the senses (namely, an intellectual intuition), because it never occurred to any one that the senses themselves might intuit a priori. The principle of the axioms of intuition states that appearances in space and time are thought of as quantitative, having extensive magnitude. 9) will be better understood when compared with Remark I., following this section. I offer, therefore, these Prolegomena as a … For the predicate of an affirmative analytical judgment is already contained in the concept of the subject, of which it cannot be denied without contradiction. For cognitions are intellectual through the understanding, and refer to our world of sense also; but objects, so far as they can be represented merely by the understanding, and to which none of our sensible intuitions can refer, are termed " intelligible." Several metaphysical propositions mutually conflict with each other. 22 See the two tables in the chapters Von den Paralogismen der reinen Verunft and the first division of the Antinomy of Pure Reason, System der kosmologischen Ideen. Without this preparation I cannot expect an unreserved assent even from the most attentive reader. Both sciences therefore stood in need of this inquiry, not for themselves, but for the sake of another science, metaphysics. Sect. The review was published anonymously in a journal and was written by Garve with many edits and deletions by Feder. When the reader is brought by this curious phenomenon to fall back upon the proof of the presumption upon which it rests, he will feet himself obliged to investigate the ultimate foundation of all the cognition of pure reason with me more thoroughly. The question does not concern the objective validity of metaphysical judgments, but our natural predisposition to them, and therefore does not belong to the system of metaphysics but to anthropology. I therefore first tried whether Hume's objection could not be put into a general form, and soon found that the concept of the connection of cause and effect was by no means the only idea by which the understanding thinks the connection of things a priori, but rather that metaphysics consists altogether of such connections. They are known only through sensuous intuition. Sect. For, as to this, every beginning of the action of a being from objective causes regarded as determining grounds, is always a first start, though the same action is in the series of appearances only a subordinate start, which must be preceded by a state of the cause, which determines it, and is itself determined in the same manner by another immediately preceding. The cognition of what cannot be an object of experience would be hyperphysical, and with things hyperphysical we are here not concerned, but only with the cognition of nature, the actuality of which can be confirmed by experience, though it [the cognition of nature] is possible a priori and precedes all experience. But these judgments are radically different from those of metaphysics. I sought to ascertain their number, and when I had satisfactorily succeeded in this by starting from a single principle, I proceeded to the deduction of these concepts, which I was now certain were not deduced from experience, as Hume had apprehended, but sprang from the pure understanding. Thesis: Everything in the world consists of something that is simple. Experience therefore can never teach us the nature of things in themselves. Skepticism originally arose from metaphysics and its licentious dialectics. It mistakenly became a dogma. 47. Berkeleian Idealism denies the existence of things in themselves. Hume started from a single but important concept in Metaphysics, viz., that of Cause and Effect (including its derivatives force and action, etc.). The logical functions of all judgments are but various modes of uniting representations in consciousness. Such a principle must be quite advantageous to reason and can hurt it nowhere in its application to nature. 16. Original source available at: http://www.utm.edu/research/iep/text/kant/prolegom/prolegom.htm, > Go to the passage referenced in the color exhibit, http://webexhibits.org/causesofcolor/ref/Kant.html, http://www.utm.edu/research/iep/text/kant/prolegom/prolegom.htm. I feel obliged to the honored public even for the silence with which it for a long time favored my Critique, for this proves at least a postponement of judgment, and some supposition that in a work, leaving all beaten tracks and striking out on a new path, in which one cannot at once perhaps so easily find one's way, something may perchance lie, from which an important but at present dead branch of human knowledge may derive new life and productiveness. This kind of judgment results when a sense perception and a judgment of perception are unified by a concept that makes the judgment necessary and valid for all perceivers. Now we appear to have this substance in the consciousness of ourselves (in the thinking subject), and indeed in an immediate intuition; for all the predicates of an internal sense refer to the ego, as a subject, and I cannot conceive myself as the predicate of any other subject. Sect. A false judgment can be made if we take a subjective representation as being objective. Two right lines, for example, which intersect one another and the circle, howsoever they may be drawn, are always divided so that the rectangle constructed with the segments of the one is equal to that constructed with the segments of the other. This question -- the highest point that transcendental philosophy can ever reach, and to which, as its boundary and completion, it must proceed-properly contains two questions. For the subjective laws, under which alone an empirical cognition of things is possible, hold good of these things, as objects of possible experience (not as things in themselves, which are not considered here). And thus I conclude the analytical solution of the main question which I had proposed: How is metaphysics in general possible? Only accidents (predicates) can be known. The answer is: By means of the constitution of our Sensibility, according to which it is specifically affected by objects, which are in themselves unknown to it, and totally distinct from those phenomena. These concepts constitute the principles of the possibility of our experience. Here right and motive power are quite dissimilar things, but in their relation there is complete similarity. Sect. In the Critique of Pure Reason it was always my greatest care to endeavor not only carefully to distinguish the several species of cognition, but to derive concepts belonging to each one of them from their common source. 6 It is unavoidable that as knowledge advances, certain expressions which have become classical, after having been used since the infancy: of science, will be found inadequate and unsuitable, and a newer and more appropriate application of the terms will give rise to confusion. This is actually here the case with regard to four natural ideas of reason, whence four assertions on the one side, and as many counter-assertions on the other arise, each consistently following from universally-acknowledged principles. By means of such an analogy I can obtain a notion of the relation of things which absolutely are unknown to me. An example of the judgments of perception, which become judgments of experience by superadded concepts of the understanding, will be given in the next note. These notes refer to the translation of Kant's Prolegomena found in the Modern Philosophy anthology edited by Watkins and Ariew and published by Hackett Publishing Company in 1998. The origin of the transcendental Ideas is the three forms of syllogism that reason uses in its activity. Look I. This science has something peculiar in the production of its a priori cognitions, which must therefore be distinguished from the features it has in common with other rational knowledge. Making plans is often the occupation of an opulent and boastful mind, which thus obtains the reputation of a creative genius, by demanding what it cannot itself supply; by censuring, what it cannot improve; and by proposing, what it knows not where to find. Experience must therefore contain all the objects for our concepts; but beyond it no concepts have any significance, as there is no intuition that might offer them a foundation. And this system, like every other true one founded on a universal principle, shows its inestimable value in this, that it excludes all foreign concepts, which might otherwise intrude among the pure concepts of the understanding, and determines the place of every cognition. And our inquiry here extends not to things in themselves (the properties of which we pass by), but to things as objects of possible experience, and the complex of these is what we properly designate as nature. Space and time, together with all that they contain, are not things nor qualities in themselves, but belong merely to the appearances of the latter: up to this point I am one in confession with the above idealists. Nature is the existence of things, so far as it is determined according to universal laws. But life is the subjective condition of all our possible experience, consequently we can only infer the permanence of the soul in life; for the death of man is the end of all experience which concerns the soul as an object of experience, except the contrary be proved, which is the very question in hand. For between every given degree of light and of darkness, between every degree of beat and of absolute cold, between every degree of weight and of absolute lightness, between every degree of occupied space and of totally void space, diminishing degrees can be conceived, in the same manner as between consciousness and total unconsciousness (the darkness of a psychological blank) ever diminishing degrees obtain. The Cosmological Ideas, by the obvious insufficiency of all possible cognition of nature to satisfy reason in its lawful inquiry, serve in the same manner to keep us from naturalism, which asserts nature to be sufficient for itself. The concept of cause accordingly is a pure concept of the understanding, which is totally disparate from all possible perception, and only serves to determine the representation subsumed under it, relatively to judgments in general, and so to make a universally valid judgment possible. When I oppose the truth of experience to dream, he never thinks that I am here speaking simply of the well-known somnio objective sumto of the Wolffian philosophy, which is merely formal, and with which the distinction between sleeping and waking is in no way concerned, and in a transcendental philosophy indeed can have no place. In so doing, we can only know objects as they appear to us, not as they are in themselves, apart from our sensations. (external to subject): physics b. § 28. The question was not whether the concept of cause was right, useful, and even indispensable for our knowledge of nature, for this Hume had never doubted; but whether that concept could be thought by reason a priori, and consequently whether it possessed an inner truth, independent of all experience, implying a wider application than merely to the objects of experience. This may serve as a slight explanation of the above proposition: that the activity of reason in disjunctive syllogisms is formally the same as that by which it fashions the idea of a universal conception of all reality, containing in itself that which is positive in all contradictory predicates. These pure concepts are not derived from experience. But this expectation is disappointed. b. What experience teaches me under certain circumstances, it must always teach me and everybody; and its validity is not limited to the subject nor to its state at a particular time. In so doing, we learn the limits of pure reason. For here is an advantage upon which, of all possible sciences, metaphysics alone can with certainty reckon: that it can be brought to such completion and fixity as to be incapable of further change, or of any augmentation by new discoveries; because here reason has the sources of its knowledge in itself, not in objects and their observation [Anschauung], by which latter its stock of knowledge cannot be further increased. Whether then we demonstrate our knowledge or our ignorance in this field, we must come once for all to a definite conclusion respecting the nature of this so-called science, which cannot possibly remain on its present footing. Pure Mathematics, and especially pure geometry, can only have objective reality on condition that they refer to objects of sense. I never can do anything to an. It is the faculty of the knowledge and use of rules in concreto, as distinguished from the speculative understanding, which is a faculty of knowing rules in abstracto. But he who undertakes to judge, or still more, to construct, a system of Metaphysics, must satisfy the demands here made, either by adopting my solution, or by thoroughly refuting it, and substituting another. In this way it was a training for reason, in whatever direction it might be turned; but this was all the good it did; service was subsequently effaced when it favored conceit by venturesome assertions, sophistry by subtle distinctions and adornment, and shallowness by the ease with which it decided the most difficult problems by means of a little school-wisdom, which is only the more seductive the more it has the choice, on the one hand, of taking something from the language of science, and on the other from that of popular discourse, thus being everything to everybody, but in reality nothing at all. When an author who is familiar with the subject of his work and endeavors to present his independent reflections in its elaboration, falls into the hands of a reviewer who in his turn, is keen enough to discern the points on which the worth or worthlessness of the book rests, who does not cling to words, but goes to the heart of the subject, sifting and testing more than the mere principles which the author takes as his point of departure, the severity of the judgment may indeed displease the latter, but the public does not care, as it gains thereby; and the author himself may be contented, as an opportunity of correcting or explaining his positions is afforded to him at an early date by the examination of a competent judge, in such a manner, that if he believes himself fundamentally right, he can remove in time any stone of offense that might hurt the success of his work. These concepts and the principles that they constitute are known before experience and are valid when they are applied to the experience of objects. Before, therefore, a judgment of perception can become a judgment of experience, it is requisite that the perception should be subsumed under some such a concept of the understanding. As the observations of the Critique on the pretensions of transcendental theology are intelligible, clear, and decisive, I have nothing more to add on the subject. No, it is found in the way that the understanding knows space. In plain language there is not, and cannot be, any such thing as metaphysics at all. When they have in vain attempted its solution, and are free from prejudices at least for a few moments, they will suspect that the degradation of space and of time to mere forms of @ur sensuous intuition may perhaps be well founded. In the first place we must state that, while all judgments of experience [Erfahrungsurtheile] are empirical (i.e., have their ground in immediate senseperception), vice versa, all empirical judgments [empirische Urtheile] are not judgments of experience, but, besides the empirical, and in general besides what is given to the sensuous intuition, particular concepts must yet be superadded-concepts which have their origin quite a priori in the pure understanding, and under which every perception must be first of all subsumed and then by their means changed into experience. Pure mathematics and pure natural science can never refer to anything other than mere appearances. The Prolegomena can be used as a general outline to be compared to the Critique. Pure mathematical propositions are not creations of imagination. Therefore in one way only can my intuition [Anschauung] anticipate the actuality of the object, and be a cognition a priori, viz. But it happens fortunately, that though we cannot assume metaphysics to be an actual science, we can say with confidence that certain pure a priori synthetical cognitions, pure Mathematics and pure Physics are actual and given; for both contain propositions, which are thoroughly recognized as apodictically certain, partly by mere reason, partly by general consent arising from experience, and yet as independent of experience. We have been long accustomed to seeing antiquated knowledge produced as new by taking it out of its former context, and reducing it to system in a new suit of any fancy pattern under new titles. The point can be put Yet rather than give further occasion to it by this word, I now retract it, and desire this idealism of mine to be called critical. The pure concepts of the understanding are concepts under which all sense perceptions must be subsumed [subsumirt] before they can be used in judgments of experience. Pure reason, however, wrongly wants to know the subject of every predicate. Had they found the genuine source of this principles discovery which requires deeper researches than they were ever inclined to make -- they would have seen, that the law of the permanence of substances has place for the purposes of experience only, and hence can hold good of things so far as they are to be known and conjoined with others in experience, but never independently of all possible experience, and consequently cannot hold good of the soul after death. Kant characterizes his more accessible approach here as an "analytic" one, as opposed to the Critique‘s "synthetic" examination of successive faculties of the mind and their principles.. But as some possible intuition must correspond to every object, we would have to assume an understanding that intuits things immediately; but of such we have not the least notion, nor have we of the things of the understanding [Verstandes wasen], to which it should be applied. Of the Distinction between Analytical and Synthetical judgments in general. Such an inquiry is of a doubtful nature; and I .acknowledge, that what I can say about it is conjecture only, like every speculation about the first ends of nature. If he cannot do this (silence however is confession), he must admit, that as metaphysics without apodictic certainty of propositions of this kind is nothing at all, its possibility or impossibility must before all things be established in a critique of the pure reason. All sensations exhibit a degree, or intensive magnitude, of sensed reality. In the latter the reader is enabled to waive for awhile the consequences of the critical researches that may be repugnant to his formerly adopted metaphysics, and first examines the grounds whence those consequences are derived. However, things in themselves may exist and there may be other ways of knowing them, apart from our experience. For without this observation it would be quite impossible to make out whether the intuitions of space and time, which we borrow from no experience, and which yet lie in our representation a priori, are not mere phantasms of our brain, to which objects do not correspond, at least not adequately, and consequently, whether we have been able to show its unquestionable validity with regard to all the objects of the sensible world just because they are mere appearances. Did a Supreme Being design nature? When I say, that I hope these Prolegomena will excite investigation in the field of critique and afford a new and promising object to sustain the general spirit of philosophy, which seems on its speculative side to want sustenance, I can imagine beforehand, that every one, whom the thorny paths of my Critique have tired and put out of humor, will ask me, upon what I found this hope. It serves as a very powerful agent to rouse philosophy from its dogmatic slumber, and to stimulate it to the arduous task of undertaking a Critique of Reason itself. Religion within the Bounds of Bare Reason, On a Supposed Right to Tell Lies from Benevolent Motives, Prolegomena to Any Future Metaphysics, English translation by Paul Carus, https://en.wikipedia.org/w/index.php?title=Prolegomena_to_Any_Future_Metaphysics&oldid=987104772, Articles needing additional references from December 2017, All articles needing additional references, Wikipedia articles with WorldCat-VIAF identifiers, Creative Commons Attribution-ShareAlike License, Subsistence and Inherence (substance and accident), Causality and Dependence (cause and effect), Community (reciprocity between agent and patient), This page was last edited on 4 November 2020, at 23:13. The fourth antinomy is solved in the same way as the third. § 52b. It is, however, more commendable to choose the first formula. But what is normal good sense? By this means alone can common sense remain sound. Whereas I say, that things as objects of our senses existing outside us are given, but we know nothing of what they may be in themselves, knowing only their appearances, 1. e., the representations which they cause in us by affecting our senses. At the beginning of this annotation I made use of the metaphor of a boundary, in order to establish the limits of reason in regard to its suitable use. Space is something so uniform and as to all particular properties so indeterminate, that we should certainly not seek a store of laws of nature in it. 7. At first all philosophical insight into the nature of sensuous cognition was spoiled, by making the sensibility merely a confused mode of representation, according to which we still know things as they are, but without being able to reduce everything in this our representation to a clear consciousness; whereas proof is offered by us that sensibility consists, not in this logical distinction of clearness and obscurity, but in the genetical one of the origin of cognition itself. There will therefore always be metaphysics in the world; nay, every one, especially every man of reflection, will have it, and for want of a recognized standard, will shape it for himself after his own pattern. For the rest, he calls my deduction of the categories and table of the principles of the understanding," common well- known axioms of logic and ontology, expressed in an idealistic manner." 41. This is a universal and necessary law that is valid for the possibility of objective experience. This contradicts the notion of a world of sense, which is merely a complex of the appearances whose existence and connection occur only in our representations, that is, in experience, since this latter is not an object in itself, but a mere mode of representation. Some Background Look at Prolegomena: David Hume awoke Kant from his “dogmatic slumber.”Kant tried to see if he could put Hume’s problem in a general form. After long reflection on the pure elements of human knowledge (those which contain nothing empirical), I at last succeeded in distinguishing with certainty and in separating the pure elementary notions of the Sensibility (space and time) from those of the Understanding. In a word, we must comprehend the natural conditions of such a science as a part of our inquiry, and thus the transcendental problem will be gradually answered by a division into four questions: It may be seen that the solution of these problems, though chiefly designed to exhibit the essential matter of the Critique, has yet something peculiar, which for itself alone deserves attention. But in regard to the latter the principle holds good, that our sense representation is not a representation of things in themselves but of the way in which they appear to us. The senses represent to us the paths of the planets as now progressive, now retrogressive, and herein is neither falsehood nor truth, because as long as we hold this path to be nothing but appearance, we do not judge of the objective nature of their motion. Such hyperbolical objects are distinguished by the appellation of Noumena, or pure beings of the understanding (or better, beings of thought), such as, for example, "substance," but conceived without permanence in time, or "cause," but not acting in time, etc. There is no doubt that the object of a pure conception either of the understanding or of reason, so far as it is to be estimated philosophically and on a priori principles, can in this way be completely known. IMMANUEL KANT Prolegomena to Any Future Metaphysics That Will Be Able to Come Forward as Science with Selections from the Critique of Pure Reason TRANSLATED AND EDITED BY GARY HATFIELD University of Pennsylvania ... Kant’s mother, whom he greatly respected and admired, died in 1737. Having adduced the clearest arguments, it would be absurd for us to hope that we can know more of any object, than belongs to the possible experience of it, or lay claim to the least atom of knowledge about anything not assumed to be an object of possible experience, which would determine it according to the constitution it has in itself. The sum of the matter is this: the business of the senses is to intuit -- that of the understanding is to think. Read "Kant's Prolegomena to any Future Metaphysics" by Immanuel Kant available from Rakuten Kobo. As to the fourth Antinomy, it is solved in the same way as the conflict of reason with itself in the third.