Prolegomena to Any Future Metaphysics.


Introduction
This paper addresses itself to the conception of metaphysics which Immanuel Kant (1724-1804) advances in his Prolegomena to Any Future Metaphysics.[1] The Prolegomena is a rewriting of some of the central arguments contained in his first edition of the Critique of Pure Reason. In the later work Kant employed the synthetic method of exposition, that is, exposition from the unknown to the known. But in the Prolegomena, he uses the analytic method of exposition, that is, exposition from the known to the unknown, hence he notes that “the method we are now following is to be analytic.”[2] In the Prolegomena, Kant situates metaphysics in the realm of the faculty of pure human reason, a faculty which he believes goes beyond its limits when it attempts to bring all reality into determinable and conditioned unity, hence his philosophical system is known as critical.[3]
In our discussion of Immanuel Kant’s Prolegomena we shall see him in conversation with two other philosophical genie, whose conception of metaphysics, Kant seems to differ with. They are Aristotle and René Descartes. We must however, admit that Kant is really complicated and difficult to understand even to himself! W. H. Walsh corroborates this when he notes that:
Kant…enjoyed a tremendous reputation throughout Germany and was beginning to be known, though scarcely to be understood, in other European countries. In his declining years, however, he suffered the mortification of seeing some of the ablest young philosophers in his own country, among them Johann Gottlieb Fichte, Friedrich von Schelling, and J. S. Beck, proclaim that he had not really understood his own philosophy [emphasis added] and propose to remedy the deficiency by producing “transcendental” systems of their own.[4]

The Metaphysics of Aristotle
            Aristotle (384-322 BCE) maintains that what constitutes the metaphysical question is simply: to be – what is there? What we today call metaphysics is for Aristotle first philosophy. Aristotle conceives metaphysics as the science of being qua being, the science of the first principles of being.[5] He also calls it wisdom[6] or divine science.[7] For Aristotle, metaphysics begins with particular beings, beings in the objective world. Metaphysics therefore is the study of primary being, which is substance. Primary being is substance because being refers to what is and, for Aristotle, the question “what being is, is just the question, what is substance?”[8] Consequently, metaphysics is the science of the first principles and cause of substance.[9] However, what is does not refer only to substance for:
[S]ome things are said to be because they are substances, others because they are affections of substance, others because they are a process towards substance, or destruction or privations or qualities of substances, or productive or generative of substance, or of things which are relative to substance, or negations of one of these things or of substance itself.[10]

Hence, being is predicated of substance primarily and only secondarily to other things.
Now, Aristotle begins his philosophical investigation from the observable/empirical world. The progression is from physics to metaphysics. In this way, he distinguishes three levels of abstraction of which metaphysics is situated in the topmost and as such is considered as the most prior of the sciences: Firstly, some objects depend on matter for their existence and concept, and so sensible matter enters their definition. Example: plants, goats, etc. Natural or empirical science treats of these kind of things. Secondly, some other objects of speculation depend on matter only for existence and not for their concept. Example: triangle, circle, square, etc. These objects are treated by the mathematical sciences. Thirdly, there are objects of speculation which do not depend on matter either for their existence or definition. Example: substance, God, soul, etc. These are treated by divine science - metaphysics.[11] Metaphysics is the most prior and first science.[12] It is instructive to note that these three level of abstraction are indicative of three levels of things/intelligible/knowable objects.
Furthermore, that which is, is that which is knowable, intelligible. In Aristotle’s metaphysical system, being and cognition are correlative concepts. So, being, that is, whatever it is that is, is knowable. It is because of this intelligibility of beings, even of those beings outside of the empirical world, that metaphysics is possible, hence he states in the first sentence of his work classified as metaphysics that “[a]ll men by nature desire to know.”[13] In contrast, Immanuel Kant, as we shall see, bars a level of being from cognition. There are certain things of which we cannot cognize – the noumena, things-in-themselves simply because they can never be objects of possible experience.[14] Kant’s metaphysical cogitation therefore calls into question the classical idea of the ad equation of cognition and being that Aristotle represents.
The Metaphysics of René Descartes
The metaphysical cognitions and postulations of René Descartes (1591-1650) can be said to center around and begin from the human subject as a res cogitans, that is, a thinking thing. This is the ground, foundation of certainty, the first principle of philosophy for Descartes, hence, his famous dictum: “I think, therefore I am.[15] He arrives at this foundation through the method of doubt by which he brought himself to doubt all he had ever known, just in case he might find something which he could not doubt.[16] By dint of this process, he arrives at the “I” as existent, since he has to exist in order to be able to doubt. More so, the nature of this “I” is thinking. This analysis is obviously rationalistic and metaphysical, since, going further, Descartes avows that he can comfortably doubt that he has a body, yet this would not tamper with the essence of the “I” as “a thinking thing.”[17] The “I” is a rational substance. Descartes also call it the soul.[18] However, it is on the basis of the certainty of the thinking self that the body and the external world as extended, is affirmed. Besides, God as infinite, the origin of ideas in the mind or soul, the cause of good, and preventer of evil influences also follows from the foundation of the ego, the rational “I.”[19]
Again, vividly expressing his rationalist commitment to the metaphysical question, René Descartes would hold contrary to Immanuel Kant, that “all that can be known of God can be shown by reasons derived from no other source than our own mind.”[20] Put simply, that God is, is a cognizable fact. Besides, Descartes held that the mind is distinct from the body.[21] The mind is indivisible and body, divisible,[22] thus “the corruption of the body does not cause the mind to perish, and thus that mortals may have hope of another life.”[23] In this way he demonstrates the fact of the immortality of the soul for “the mind is of its nature immortal.”[24]
In sum, Descartes upholds the view that being, the primary subject of metaphysics, is, and that the thinking mind, shielded from error by the perfect God can access this reality. In his system, however, and unlike Aristotle and Immanuel Kant, he repudiates the input of the senses in the cognition of reality, hence, reason alone can cognize reality. Kant would not give leeway to this Cartesian dismissal of the senses, which is why, against such rationalistic bias for the senses, he would posit that “thoughts without content are empty, intuitions without concepts are blind.”[25]
The Metaphysics of Immanuel Kant – Transcendental idealism
In his Prolegomena, Immanuel Kant attempts to address the question of the possibility of metaphysics and its necessary systematization. This question comes up because some form of systematization is observed in the other sciences namely, mathematics and natural science but not in metaphysics. The basis of the possibility of the knowledge of reality which all three sciences confirm is the synthetic a priori. Kant begins by showing how synthetic a priori knowledge is possible in mathematics and natural science. 
However, in his attempt to answer the metaphysical question: “what is there?” Kant rejects the traditional methodology of cognition and metaphysics, which claims that we can know things in themselves; and adopts a unique one, which he termed transcendental idealism. He argues that his transcendental idealism is different from Descartes’ dreaming idealism, George Berkeley’s visionary and mystical idealism,[26] for “my idealism concerns not the existence of things (as is idealism originally)…but concerns the sensuous representation of things, to which space and time especially belong.”[27] The main point of Kant’s transcendental idealism is that, although there are things that exist beyond our experience, knowledge of these things is impossible, since transcendental knowledge is ideal, not real.[28]
Transcendental idealism is a theory that holds that all objects of any experience possible to us are nothing but appearances, that is, mere representations, which have no independent existence outside our thoughts. It is characterized indirectly by its contrast with realism according to which these objects are “self-subsistent things,” or “things in themselves.”[29] It involves the distinction between phenomena and noumena. Whereas phenomena refers to objects as they appear to us, that is, the world as we experience it, noumena refers to objects as they are in themselves, which are purely intelligible, or non-sensual realities.[30]
However, let us clarify some concepts for a better understanding of Immanuel Kant’s transcendental philosophical cognition. There is a posteriori knowledge, which is the particular knowledge we gain from experience, as well as a priori knowledge, which is the necessary and universal knowledge we have independent of experience. Moreover, there are two kinds of judgment: analytic and synthetic judgments. Kant posits that in analytic judgment the concept in the predicate is contained in the subject. Whereas in synthetic judgment, the predicate concept contains information not contained in the subject concept, hence, it is informative not just definitional or tautological as analytic judgments are. From this analysis, Kant puts forth his philosophical ingenuity in positing of synthetic a priori judgments. These are such judgments that both give us new knowledge and are not derived from experience.[31] The synthetic a priori is the fulcrum of Kant’s adjudication of the age-long rationalists-empiricist conflict and the root of his critical metaphysics.
Like other modern philosophers, Immanuel Kant develops his critical philosophy around the individual, the “I.” The philosophical concern is with the human person and the possibilities around the human person. Consequently, Kant’s attempt to answer the metaphysical question “what is there?” sees him describe something similar to Plato’s two worlds of reality. Unlike Plato, however, who would avow that the human mind can ascend to the knowledge of things most perfect in the other transcendental world, Kant holds that the transcendental is an aspect of reality that theoretical human cognition is not privy to. This the world of noumena, things in themselves.[32] In all discourses of metaphysics, one sees an intercourse of being and cognition, metaphysics and epistemology. Indeed this correlation is inevitable since it is that which is, whether as a state of affairs or as a thing, that can be known. It is on this premise that one sees Kant developing an epistemological system in answer to the question of metaphysics. Within this epistemological system he exposes the limits of the power of human cognition in so far as metaphysics is concerned. What the human person does cognize and can cognize are those things and concepts of those things that are given to experience, phenomena in contrast to noumena.[33]
Furthermore, human cognition is structured in such a way that, for Immanuel Kant, possible and therefore authentic and reliable human knowledge follows the schema of sensibility through understanding.[34] Little wonder Kant believes that “besides intuition there is no other kind of cognition than through concepts.”[35] This assertion obviously calls into question the contribution of pure reason in human cognition. Again, this follows from the fact that what the human person knows are of and about the experiential, the experientially possible, the phenomenal, the appearances of things-in-themselves.

Sensibility and Understanding
Accordingly, cognition by sensibility is via the intuition of space and time. Whatever it is that is cognizable by sensibility is simply spatio-temporal. Space and time, for Immanuel Kant are a priori forms of sensible intuitions. It is by means of these forms of sensibility that the human person cognizes phenomena, things as they appear. Now, because things in themselves are not part of the possibility of experience, they cannot be subjected to the a priori forms of sensibility, namely, space and time. They cannot be cognized at this level of cognition. Moreover, space and time are the forms of outer and inner sense respectively. Kant avows that:
By means of outer sense (a property of our mind) we represent to ourselves objects as outside us, and all as in space. In space their form, magnitude, and relation to one another is determined, or determinable. Inner sense, by means of which the mind intuits itself, or its inner state gives, to be sure, no intuition of the soul itself, as an object; yet it is still a determinate form, under which the intuition of its inner state is alone possible, so that everything that belongs to the inner determinations is represented in relations of time. Time can no more be intuited externally than space can be intuited as something in us.[36]

Besides, cognition by sensibility, there is cognition by understanding, which is made possible by means of a synthesis of experiential data through the application of the concepts of understanding. These concepts are either transcendental – not derived from experience, or empirical – derived from experience.[37] By these concepts, the human mind cognizes objects derived from a synthesis of sense experience, thus “there are two conditions under which alone the cognition of an object is possible: first, intuition, through which it is given, but only as appearance; second, concept, through which an object is thought that corresponds to this intuition.”[38] The mark of the operation of understanding is necessity by means of the categories. The understanding prescribes the rules for the connection of objects of possible experience, thus, the understanding does not draw its (a priori) laws from nature, but prescribes them to it.[39] It is in this that Immanuel Kant’s Copernican Revolution must consist: that the human mind is no longer out in search of the laws of nature, but that the laws of nature are imposed on nature by the human mind. Nature corresponds to mind and not mind to nature.
Pure Reason
While the understanding connects experience in terms of laws by means of the categories, and thereby making judgements of experience possible, pure reason searches for deeper unity by means of its ideas. Immanuel Kant asserts that the ideas are “necessary concepts whose object nevertheless cannot be given in any experience.[40] Now, because no objects of the ideas can be ever given in possible experience, they are transcendental.[41]
Accordingly, Immanuel Kant distinguishes three transcendental ideas of pure reason: psychological ideas, cosmological ideas, and theological ideas.[42] First, psychological ideas try to identify some sort of substance or ultimate subject underlying all the predicates that can be applied to a subject. For instance, when describing internal states: “I think or “I dream” for example, we refer back to an “I” that is fundamental, indivisible, and unique. However, Kant is of the opinion that this “I” is not a thing or a concept that we can have knowledge of in itself. But by being capable of experience at all, suggests that we have some sort of consciousness. For Kant, the “I” is merely “a designation of the object of inner sense insofar as we do not further cognize it through any predicate.”[43] This self is the matrix of consciousness and the principle of the transcendental unity of apperception. Apperception is a Leibnizan concept which describes the consciousness or “awareness of one’s perceptions.”[44] 
Second, cosmological ideas, according to Kant, are classified into four distinct antinomies[45] or, pairs of seemingly contradictory metaphysical propositions:
Thesis              -          The world has, as to time and space, a beginning (limit)
Antithesis        -          World is, as to time and space, infinite.
Thesis              -          Everything in the world is simply constituted.
Antithesis        -          There is nothing simple, but everything is composite.
Thesis              -          There are in the world causes through freedom
Antithesis        -          There is no freedom, but all is nature
 Thesis             -           In the series of world-causes there is some necessary being.
Antithesis        -            There is nothing necessary in the world, but in these series, all are contingent.[46]
According to Immanuel Kant, the thesis and the antithesis as represented above are the extreme positions of the rationalist and the empiricists respectively, which are unknowable to us. While the rationalist held onto the knowledge of the noumena, the empiricists held onto the phenomena. However, Kant avows that the first two theses and antitheses were all false because they view the world itself as a totality. This according to Kant is impossible since our knowledge of the world is discursive,[47] that is, in instalments, and not in its totality. 
Third, in theological ideas, Kant opines that any “proof” of God’s existence is a purely intellectual exercise, and cannot lead us to fundamental and substantial conclusions regarding the nature of experience. For any rational science or metaphysics that seeks to prove the existence of God run beyond the boundaries of reason.[48]
More so, in order to address the question of how metaphysics is possible, he demonstrates how both mathematics and pure natural sciences are possible by appealing to our pure intuitions of time and space, and our faculty of understanding to make sense of experience. However, metaphysics deals with matters that are beyond the realm of experiences such as God and soul, or with the totality of possible experience like whether the world has a beginning and an end. Thus, intuition and understanding are irrelevant to metaphysical realities.  Immanuel Kant thus avers that:
All pure cognitions of the understanding have the feature that the concepts can be given in experience, and the principles can be confirmed by it; whereas the transcendent cognitions of reason cannot either, as ideas, be given in experience or, as propositions, ever be confirmed or refuted by it.[49]

Consequently, as we have already seen in the summary above, Immanuel Kant was of the view that mathematics, natural science and metaphysics contain synthetic a priori knowledge. And this is what distinguishes his metaphysics from that of others. For in his cognition, he opines that the mind has a priori concepts of time, space and causation, which it imposes on sensations in order to understand them or make them intelligible. Thus, by subjecting the sensations, which we perceive to the intuitions of space and time, we have empirical intuitions and judgments of perception,[50] which is subjective. To give objectivity or universality to this our experience, we subject it to the faculty of understanding. Thus, Kant claims that space and time only apply to phenomena and not to noumena for things in themselves are non-spatial and non-temporal. However, if, according to Kant, we cannot know the transcendental world, and we know things if and only if they exist in space and time, how do we relate to the ideas of space and time, which are forms? How is it possible that we experience such?
Furthermore, Immanuel Kant affirms that all concepts, including the categories, only have meaning in relation to possible experience and the objects of possible experience, that is, to phenomena and not to noumena. This claim is a limitation to Kant’s transcendental idealism since he recognises that, we are not passive recipients of sensory experience. However, in his book, I and Thou, Martin Buber (1878-1965), who was highly influenced by Kant’s Prolegomena found two answers to the nature of time. If time and space are pure forms of perception, then, they pertain to phenomena and not to things in themselves, noumena. Thus, time has to do with the ways in which we experience not just things but people also. This would imply that we have an object experience of people. If this is the case, then it would be contrary to Kant’s Categorical Imperative, which states that people should not be used as a means to an end; since our experience of people would involve “I – it relation.” Furthermore, Buber goes beyond Kant to describe man as one who has two distinct ways of engaging the world, namely, experience and encounter.[51] The former involves a subject-object relationship - that which exist between I and It; while the latter involves a subject – subject relationship, an encounter between I and You (thou), and this, according to Buber is deeper than the former.[52]
More so, Immanuel Kant argues that we cannot know things in themselves. This assertion raises some problems. The first concern is, if things exist and we do not know them in themselves, an objective knowledge of things can no longer be considered but only subjective personal knowledge. Hence, individual knowledge of things must always prevail and be accepted far and above common and general knowledge, even when such individual knowledge seems contrary to the obvious. Besides, if we cannot know things in themselves, it means that we cannot know the essence of things. Now, if we cannot know the essence of things, how do we know then that things exist? If we know things only as they appear to us, does it mean that we know only the shadow of things?
On the contrary, Thomas Aquinas in his Summa Theologiae, opines that we can know the essence of things, that is, we can know things as they are themselves. He argues that what we know subjectively, is the same as what is out there objectively, since the material things known must necessarily exist in the knower, not materially but immaterially;[53] thereby giving us a remedy to Kant’s limitations. For Aquinas, our conceptions of things are abstracted from the sensory data, which are authentic representations of the concrete reality.[54] Hence, the subject and object will become one in an ideal order; the object will become known by the knowing subject. The imperative of Aquinas’ concept of cognition of things comes to be appreciated when there is a synthesis of cognitive processes and substantial experience.
From the foregoing, one would agree to the fact that Immanuel Kant has rebutted traditional metaphysics by critiquing pure reason; and by reducing the issues of mathematics and natural sciences to the faculties of sensibility and understanding; and then that of metaphysics to the faculty of pure reason, which helps us reason independent of experience, that is, a priori cognition.[55] Hence, metaphysics for Kant is the product of pure reason. Not reason as applied to experience as traditional metaphysics conceived it. But reason as that which tries to complete experience; tries to tie all experience together, thereby giving it meaning.
Does the Moral Agent Need God and/or organized Religion?
            If, as Immanuel Kant wants the human person to believe, that the latter cannot make any assertive claim about God because such a being is beyond possible human experience and cannot be subjected to the forms of intuition and the categories of understanding, how does a morality that is founded on this same God survive? Moreover, if the moral agent can be moral simply based on a rational subjective ascent to a moral maxim, does such a person need any religious authority to stay moral? Based on his deontological, duty-based system of ethics, Kant answers in the preface to the first edition of his Religion within the Bounds of Reason that:
So far as morality is based on the conception of the human being as one who is free but who also, just because of that, binds himself through reason to unconditional laws, it is in need neither of the idea of another being above him in order that he recognize his duty, nor, that he observe it, of an incentive other than the law itself.[56]

For Kant therefore, the moral agent is simply a rational agent who, though free, conditions herself to a moral maxim simply on the grounds of duty and respect for the law, not because the law was given by God or imposed by some religious institution. The kind of religion that Kant proposes in the Religion within the Bounds of Reason is the religion of the moral ideal that he believes all religions are supposed to emulate.[57]
More so, this moral religion is very unlike and simply opposed to organized religion. It does not require any form of liturgy or public devotional practices. All that is needed is the keeping of the moral maxim. Members of this religion just need to be moral. In this way they contribute to the incumbency of the moral law. Consequently, “Kant thinks that our own reason gives us the law. Morality can be understood only if we see that each of us is equally a law giving member of the group of those who must also obey the moral law. He holds that each of us is both to legislate the law and to obey it.[58] Such a religion is made up of autonomous rational individuals, who may ascent to the idea of God. The idea of God comes in as tenable since a being necessary to make sense of moral experience is needed.[59] E. L. Allen asserts this need in this way:
We desire a state of things in which goodness is accompanied by the happiness it deserves. We could not be content to see good for ever in the dungeon and evil for ever on the throne. But happiness belongs to the realm of what is and duty to that of what ought to be, and only the latter is within the range of our freedom. We must therefore postulate, believe that there is God who can bring these two realms together and effect the union of goodness and happiness.[60]

Hence, in Immanuel Kant’s moral philosophy, God is a necessary postulate of rational faith and is needed by the moral agent. However, the moral agent does not do good and avoid evil just in order to be rewarded by God, for if it is done so, the act would cease to be good.[61] This is because it would become a hypothetical rather than a categorical imperative.[62] Moreover, organized religion is not necessary for the moral life. This is because the rational agent makes the inner choice of conscience to obey the moral law that she herself was part of making. This conclusion is indeed the seedbed of a secularization true to its name.[63] Is secularization – the expulsion of God and religion from the public sphere, not the approaching and abiding trend today?
Conclusion
            The paper has attempted to discuss Immanuel Kant’s reflection on the metaphysical question: what is there? In this discourse, it has been a thing of interest to note that the metaphysical question: “what is there?” almost always presupposes and leads to the epistemological question: can what is there be known? The answer to the first question cannot be: nothing. This is insofar as the inquirer is a something asking the question. So, at least, the inquirer is there and so nothing cannot be the answer. An affirmative answer to the second question is indicative of a positive answer to the first question. Hence, if knowledge is possible, then the object of knowledge must exist. Aristotle says that every object of knowledge exists and every existent object is knowable. So, for him, the epistemological and the metaphysical questions really coincide. René Descartes’ perspective to the epistemo-metaphysical question describes the requirement of the inquirer into the question. This requirement, for him is the foundation of knowledge of all that there is. He concludes that the inquirer into the epistemo-metaphysical question is a thinking self, a res cogitans. This thinking self is the basis of all questions and answers, both epistemological and metaphysical.
            Nevertheless, a further development in and a new twist to the epistemo-metaphysical question is introduced by Immanuel Kant who answers positive to the metaphysical question but discusses the limits of the epistemological question. So, yes! To the metaphysical question, there is something. There are things. But, to the epistemological question, the human knower cannot know them as they are. They are there, at least, they help the human person to make sense of experience. Thus, things-in-themselves are transcendentally ideal. They must be posited for reality to make sense. They can only be known as they appear to the human knower. Is this a limitation on the things themselves? Kant answers in the negative. The problem is with human cognition. If things do not enter human cognition through the senses, the knowing human cannot know them. Little wonder Kant would keep reiterating as his philosophical mantra: “thoughts without content are empty, intuitions without concepts are blind.”[64] His metaphysical system then, is a critique of the powers of reason, a limitation of reason’s reach. But is this effort not rather too ambitious of Kant? How does he claim to know in entirety, the reach of reason? Is reason itself a given in possible experience that he can claim to know fully and even determine its extent?


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[1] Hereafter, simply, Prolegomena.
[2] Immanuel Kant, Prolegomena to any Future Metaphysics translated and edited by Gary Hatfield (Cambridge: Cambridge University Press, 2004), p.27
[3] W. H. Walsh, “Kant, Immanuel,” Donald M. Brochert (ed.), Encyclopedia of Philosophy, vol 5, 2nd edition. Farmington Hills: Thomson Gale, p.10.
[4] W. H. Walsh, “Kant, Immanuel,” Donald M. Brochert (ed.), Encyclopedia of Philosophy, vol 5, 2nd edition, 2006. Farmington Hills: Thomson Gale, pp.8-9.
[5] Cf. Aristotle, “Metaphysica,” in Richard McKeon (ed.) The Basic Works of Aristotle (New York: Modern Library, 2001), p.731
[6] Cf. Samuel Enoch Stumpf, The History and Problem of Philosophy, (New York: McGraw-Hill, Inc., 1994) p.88.
[7] Cf. Aristotle, “Metaphysica,” in Richard McKeon (ed.) The Basic Works of Aristotle, p.693
[8] Aristotle, “Metaphysica,” in Richard McKeon (ed.) The Basic Works of Aristotle, p.784
[9] Cf. Aristotle, “Metaphysica,” in Richard McKeon (ed.) The Basic Works of Aristotle, p.732
[10] Aristotle, “Metaphysica,” in Richard McKeon (ed.) The Basic Works of Aristotle, p.732
[11] Cf. Aristotle, “Metaphysica,” in Richard McKeon (ed.) The Basic Works of Aristotle, p.779
[12] Cf. Aristotle, “Metaphysica,” in Richard McKeon (ed.) The Basic Works of Aristotle, p.779
[13] Aristotle, “Metaphysica,” Richard Mckeon (ed.) Basic work of Aristotle, p.689
[14] Cf. Immanuel Kant, Critique of Pure Reason, translated and edited by Paul Guyer and Allen W. Wood (Cambridge: Cambridge University Press, 1998), p.338
[15] René Descartes, Discourse on Method, translated by Donald A. Cress (Cambridge: Hackett Publishing Company, 1993), p.19
[16] René Descartes, Discourse on Method, translated by Donald A. Cress, p.18
[17] René Descartes, Meditations on First Philosophy, translated by Donald A. Cress (Cambridge: Hackett Publishing Company, 1993), p.65
[18] René Descartes, Discourse on Method, translated by Donald A. Cress, p.19
[19] René Descartes, Discourse on Method, translated by Donald A. Cress, p.20
[20] René Descartes, Meditations on First Philosophy, translated by Michael A. Moriarty (New York: Oxford University Press, 2008), p.4
[21] Cf. René Descartes, Meditations on First Philosophy, translated by Michael A. Moriarty, p.4
[22] Cf. René Descartes, Meditations on First Philosophy, translated by Michael A. Moriarty, p.10
[23] René Descartes, Meditations on First Philosophy, translated by Michael A. Moriarty, p.11
[24] René Descartes, Meditations on First Philosophy, translated by Michael A. Moriarty, p.11
[25] Immanuel Kant, Critique of Pure Reason translated and edited by Paul Guyer and Allen W. Wood, (Cambridge: Cambridge University Press, 1998), pp.193-194
[26]Cf. Immanuel Kant, Prolegomena to Any Future Metaphysics, revised by James W. Ellington (Hackett Publishing Company, Inc., 1985), pp.4-6.
[27]Immanuel Kant, Prolegomena to Any Future Metaphysics, revised by James W. Ellington, pp.36–7.
[28] Matt McCormick, “Immanuel Kant: Metaphysics” Internet Encyclopedia of Philosophy, www.iep.utm.edu/kantmeta accessed 24/11/15
[29] Wilfrid Sellars, “Kant’s Transcendental Idealism” http://www.ditext.com/sellars/ktl.html accessed 19/11/15
[30] Cf. Samuel E. Stumph, Philosophy: History and Problems, 5th ed., p.309.
[31] Cf. E. L. Allen, From Plato to Nietzsche (Greenwich: Association Press, 1957), p.120
[32] Cf. Immanuel Kant, Critique of Pure Reason, translated and edited by Paul Guyer and Allen W. Wood (Cambridge: Cambridge University Press, 1998), p.338
[33] Cf. Immanuel Kant, Prolegomena to Any Future Metaphysics, revised by James W. Ellington, p.106
[34] See the section on “The Transcendental Doctrine of the Elements” in Immanuel Kant, Critique of Pure Reason, translated and edited by Paul Guyer and Allen W. Wood, p.153
[35] Immanuel Kant, Critique of Pure Reason, translated and edited by Paul Guyer and Allen W. Wood, p.205
[36] Immanuel Kant, Critique of Pure Reason, translated and edited by Paul Guyer and Allen W. Wood, p.157
[37] Cf. Immanuel Kant, Critique of Pure Reason, translated and edited by Paul Guyer and Allen W. Wood, p.220
[38] Immanuel Kant, Critique of Pure Reason, translated and edited by Paul Guyer and Allen W. Wood, p.225
[39] Immanuel Kant, Prolegomena to any Future Metaphysics, translated and edited by Gary Hatfield, p.72
[40] Immanuel Kant, Prolegomena to any Future Metaphysics, translated and edited by Gary Hatfield, p.80
[41] Cf. Immanuel Kant, Prolegomena to any Future Metaphysics, translated and edited by Gary Hatfield, p.82
[42] Cf. Immanuel Kant, Prolegomena to Any Future Metaphysics, revised by James W. Ellington, p.79
[43] Immanuel Kant, Prolegomena to any Future Metaphysics, translated and edited by Gary Hatfield, p.86
[44] Immanuel Kant, Prolegomena to any Future Metaphysics, translated and edited by Gary Hatfield, p.xxv
[45] The word antinomy means a contradiction between two apparently equally valid principles or between inferences correctly drawn from such principles.
[46] Immanuel Kant, Prolegomena to Any Future Metaphysics, revised by James W. Ellington, p.80.
[47] Immanuel Kant, Prolegomena to any Future Metaphysics translated and edited by Gary Hatfield, p.86
[48] William F. Lawhead, The Voyage of Discovery: A Historical Introduction to Philosophy (Belmont: Wadsworth, 2004), p.337.
[49] Immanuel Kant, Prolegomena to Any Future Metaphysics, revised by James W. Ellington, p.71.
[50] Thus, judgment of perception and empirical intuition deal with our senses and what they tell us, while judgment of experience deals with the faculty of understanding. It would seem that while judgements of perception are subjective, some form of objectivity of experience comes from judgments of experience.
[51]One (that of encounter) of which the modern age totally ignores. 
[52] Cf. Michael Zank, Zachary Braiterman, “Martin Buber”, last modified December 4, 2014, http://plato.stanford.edu/entries/buber/ accessed 23/11/15.
[53] Cf. Thomas Aquinas, Summa Theologiae, I, q. 84, art. 2. Transl. by Fathers of the English Dominican Province. Benziger Bros edition, 1947.
[54] Fernand ‘Van Steenberghen, Epistemology (New York: Joseph F. Wegner, Inc., 1949), p.61.
[55] Cf. Immanuel Kant, Prolegomena to Any Future Metaphysics, revised by James W. Ellington, p.11.
[56] Immanuel Kant, Religion within the Bounds of Reason in Kant: Religion within the Bounds of Reason and other Writings edited by Allen Wood and George di Giovanni (Cambridge: Cambridge University Press, 1998), p.33
[58] J. B. Schneewind, Why Study Kant’s Ethics in Immanuel Kant, Groundwork for the Metaphysics of Morals edited and translated by Allen W. Wood (London: Yale University Press, 2002), p.84
[59] For Bertrand Russell, Kant’s moral argument for the existence of God rests on this: that there must be a being who would bring about justice. See Bertrand Russell, Why I am not a Christian (Kansas: Haldeman-Julius Publications, 1929)  pp.4-6
[60] E. L. Allen, From Plato to Nietzsche, p.128
[61] E. L. Allen, From Plato to Nietzsche, 126
[62] A line of action is a hypothetical imperative if it is just a matter of expediency - a means to an end; and it is categorical if it is a matter of duty.
[63] The term secularization is believed to have evolved from the Latin word saeculum that was used to describe the world as separated from the cloistered framework of the religious or monastic community.
[64] Immanuel Kant, Critique of Pure Reason translated and edited by Paul Guyer and Allen W. Wood, pp.193-194

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