Going beyond the biological and physiological limitations imposed on us by the human body is something which the human race has strived to do throughout its history. There is something about our human nature that compels us to strive for improvement and enhancement in our physical and mental performance, and to stretch ever further the boundaries of human accomplishment. Nowhere can a stronger desire for enhanced performance be found than in the realm of competitive sport and, it is certainly arguable that, there are very few sports that can rival the competitiveness, endurance and physical exertion involved in the sport of boxing. Transhumanism is borne of this desire for continuous improvement and the refusal to resign ourselves to the restrictions placed on us by our natural biological constitution and environment, enhancing human capabilities and capacities by way of new and emergent technologies. With regard to sport, transhumanism could provide us with the ability to train longer, run, swim or cycle faster, jump higher, throw further and, in the case of boxing, punch harder. However, it is not restricted or confined to the enhancement of our physical powers, but could equally-well serve to improve our psychological capacities and alter the way in which we perceive and experience the world. In this way transhumanism could be employed to change the content of experience.

The purpose of this thesis is to provide a robust epistemological justification for Evidence Based Medicine (EMB), and thereby to demonstrate the epistemological short comings of Complementary and Alternative Medicine (CAM). CAM has received support from both philosophers, such as Rorty and Feyerband, and the Sociology and Anthropology of Medicine. The thesis will thus review both the internal coherence and the application of non-realist arguments, and counter non-realism with the realist epistemology and philosophy of science that is represented by C.S. Peirce’s pragmatism. Rorty and Feyerabend and others have developed radical forms of scientific antirealism in the latter 20th century. Subsequently, sociologists developed even more intractable forms of anti-realism, which they applied to the social study of science. This approach served to challenge the legitimacy of orthodox scientific practice (including EMB). A practical expression of this controversy was immediately identified in the question of the role of scientific authority in a democratic society. That question was immediately applied to the status of alternative medical systems and their legitimacy vis-a-vis EBM in terms of the controversy over what has come to be termed "medical pluralism": If scientific medicine has no particular authority, should other, medical systems, epistemically incompatible with EBM, be made available as well? The thesis will suggest that non-realism is in fact a marginal position within the philosophy of science. Scientists, medical researchers and medical practitioners may thus appeal to the philosophy of science in order to justify their authority in the face of challenges from CAM. However, it will be suggested that they are frequently ill-served by a reliance on a simplistic understanding of the philosophy of Karl Popper. An alternative will be proposed in the philosophy of C. S. Peirce. His pragmatism offers to medical research and medical practice a way of understanding and justifying the scientific process, a justification of realism in the face of non-realism, and a resource for the criticism of CAM and medical pluralism, as at once epistemologically ill grounded and potentially dangerous to patients and the general public.

This thesis is a critical study of the prospects for contemporary accounts of ethical intuitionism. Ethical intuitionism is an epistemological theory about the nature of our justified ethical beliefs, whose central claim is that we have at least some non-inferentially justified beliefs. Having been out of favour for much of the latter-part of the twentieth century, ethical intuitionism is enjoying something of a renaissance. Contemporary proponents of the view have shown that ethical intuitionism need not fall foul of the main objections previously brought against it. Furthermore, developments in epistemology have helped to make the notion of non-inferential justification (and the associated view, epistemological foundationalism) more philosophically respectable. As I will suggest, non-inferentially justified belief paradigmatically involves a belief that is justified by a non-doxastic state. In this thesis I will consider four accounts of ethical intuitionism which each claim that a particular kind of non-doxastic state can ground justified ethical beliefs: understandings, intellectual seemings, perceptual experiences and emotional experiences. Note that contemporary ethical intuitionists do not commit themselves to there being a distinctively ethical non-doxastic state. Rather, contemporary ethical intuitionists adopt a sort of innocence by association strategy, suggesting that that we gain non-inferential justification in ethics in much the same way as we get non-inferential justification in other domains. It is my purpose in this thesis to subject each of these four accounts of contemporary ethical intuitionism to sustained philosophical criticism. Although I do not think that ethical intuitionism is implausible, it is my view that the current enthusiasm for the position ought to be seriously tempered, and that much work will need to be done in order to make it acceptable as a meta-ethical view. Firstly, with regard to the understanding (self-evidence) account I argue that there are serious problems with the view that the substantive Rossian principles are non-inferentially justifiably believed on the basis of an adequate understanding of their content. Secondly, I go on to suggest, inter alia, that proponents of the intellectual seemings account of intuitionism cannot appeal to their favoured general epistemological principle in order to ground their ethical epistemology. Given this, much work needs to be done on their part in order to show why we ought to think that intellectual seemings with an ethical content that is substantive get to justify. Thirdly, against the ethical perception account I suggest that even if it is true that ethical agents have perceptual experiences which represent ethical properties, it is not at all obvious that this supports ethical intuitionism, since insofar as such experiences get to justify, it seems plausible that they will ground inferentially or mediately justified beliefs. I do, however, suggest that a related perceptual view may be able to ground a plausible account of non-inferentially justified ethical beliefs. Finally, I consider the ethical emotions account. Given that this is a relatively new view on the philosophical scene I spend much of my time defending it against some serious recent objections brought against it. However, I will also suggest that there are question marks surrounding the epistemological credentials of emotional experiences and that much work will therefore need to be done in order to make the view that emotional experiences do in fact non-inferentially justify ethical beliefs acceptable.

My interests lie in consideration of conceptions of authenticity and inauthenticity from the perspective of ethical theories which conceive of the good for man with reference to human nature and concomitant beliefs regarding the most appropriate realisation of human capacities. Here, I find particular interest in the philosophical styles embodied by the existentialist and Lebensphilosophie movements. Such approaches sit outside the traditional frames of reference provided by deontological and utilitarian approaches to ethical reasoning and yet do I shall argue, share significant similarities with ancient aretaic styles of ethics. Here, I take Aristotle to represent those aspects of ethical thought which are quintessentially of this period of intellectual history. I find not merely points of comparison but a fruitful way in which to re-examine the thought of thinkers such as Nietzsche, Scheler, Heidegger and Sartre with reference to styles of ethical enquiry which place primacy upon an objective conception of happiness which centres upon the appropriate realisation of human capacity understood with reference to Aristotle's Function Argument. I argue that phenomenological analysis shares a conception of self-perspicuity in which the agent reflects upon the full contents of their conscious experience. By this means, certain self-delusions which impede entry into the ethical life, may be removed. Additionally, whilst Aristotle's 'non-law' conception of ethics shares with existentialist thought an understanding of the human situation and its normative concerns in isolation from dualistic and theistic metaphysical speculation, such philosophy is still able to provide clear and objective ethical standards - standards often lacking within existentialism. For instance, whilst Nietzsche's pronouncement of the 'death of God' signals the death also of Christian morality, we find that such philosophy is not without normative implications and in fact can be derived to a large degree from assent towards a radical and more severe ethical self-discipline. Indeed, central certainly to the thought of Nietzsche, Heidegger and Sartre is an understanding of the role of self-deception in the human condition. Here a useful distinction may be made between those types of self-deception which may be understood as structural that is to say which are representative of an essential characteristic of human being at the abstract level - and those types of self-deception which may be described as 'motivated' or 'psychological' which relate to more specific types of self-deceptive engagement. I believe it is useful to examine both Nietzsche, Heidegger and Sartre through the lens of such interpretation, I find for instance that it is of use to examine the early Sartre as having a purely structural interpretation of bad faith (described by Jeanson as 'natural' bad-faith) whilst moving towards a psychological account in his later work, an account which has more specific moral implications with the possibility of 'willed conversion' to authenticity (Santoni). Additionally with Nietzsche, we also find a similar distinction between a self-deception which is in some sense preconditional and a motivational account of self-deception in which the agent infused with ressentiment falsifies reality in favour of subjective needs which are ultimately destructive of life-enhancement. In this sense the vicious individual can be said to have achieved merely a false optimum, and moreover, false from an objective standpoint.

This thesis provides a detailed analysis of the dialectic of conscience within Hegel’s Philosophy of Right. It aims to show that Hegel provides a fundamental role for conscience within the state and, thus, that Hegel preserves the right to subjective freedom within ethical life. In doing so, it aims to unite divided opinion on the role of conscience within Hegel’s political philosophy and to further disarm the charge that Hegel’s state advocates repressive or authoritarian political structures. In order to pursue this argument, this thesis first examines the emergence of conscience within the morality section of the text. It presents the moral conscience as the fruition of subjective freedom; as possessing the right to produce its own convictions and determine for itself what is good. However, it then continues to highlight the necessarily formal nature of the moral conscience and claims that, because of this formality, the content of conscience is always contingent. As such, the moral conscience is always in danger of willing evil; and it is precisely this danger that necessitates the move into ethics. The moral conscience is sublated by the true, ethical conscience. This thesis presents its own reading of the Aufhebung from the moral conscience to the true conscience of ethical life, which it believes properly reflects the dialectical progression of freedom within the text. It argues that, during the process of Aufhebung, the essential moments of moral conscience are retained and only the negative aspects are lost. In particular, it claims that conscience’s right to produce its own convictions (and, thus, the right to subjective freedom) is preserved within ethical life, but that the contingency of conscience is not. As such, true conscience (unlike the moral conscience) wills the good both in and for itself. This does not mean that true conscience cannot make mistakes. But it does entail that true conscience cannot put its own convictions beyond criticism. For this reason, this thesis also maintains that the formal conscience of morality, in its non-aufgehoben form, has no place within the ethical realm. This thesis locates true conscience’s function in the disparity between the actual and the existing state. It argues that, in recognising the rational principles inherent in society and by transforming the existing world to conform more faithfully to these principles, true conscience plays an essential role in keeping the state in line with its own, rational essence. However, it also maintains that this type of immanent critique extends only to reform, and not to not radical, social criticism. The thesis concludes by describing true conscience’s role in the legislative power.

My thesis focuses on Nietzsche’s ethics. More precisely, its main objective is to explore Nietzsche’s substantive ethical framework in a comprehensive, detailed, and systematic manner. Furthermore, the thesis also attempts to examine the epistemological, non-ethical ground of the Nietzschean substantive ethics. Also, it deals with Nietzsche’s critique of conventional morality, and explains Nietzsche’s criticism of morality in terms of his substantive ethics. The central argument of the thesis is, very briefly, that Nietzsche’s philosophy as a whole does have a distinctive, substantive ethical system. Its constitutive elements or contents, being coherently related, are rich, complicated, and concrete. The major category Nietzsche employs in his ethics is the notion of ‘value’ understood as merit or desirability; he is not much concerned with the right or obligatory. Nietzsche views some human qualities, abilities and states and a style of life as noble and desirable for us. Specifically, the creative way of life, creative capacity, self-discipline, the capacity for ‘self-commanding’, knowledge, health, strong affectivity, and vitality constitute the core of Nietzsche’s evaluative standard. Moreover, a variety of dispositions, such as honesty, solitude, courage, and magnanimity, position themselves within his theory of value and are posited as crucial virtues. Finally, my thesis aims at analysing these particular contents of Nietzsche’s substantive ethical system and to examine how the system as a whole works. As such, the thesis is fundamentally an exposition based upon Nietzsche’s own texts, especially, his later works including Thus Spoke Zarathustra, Beyond Good and Evil, The Genealogy of Morals, Twilight of the Idols, and The Antichrist.

Christine Korsgaard has attempted to defend a distinct approach to metaethics – Neo-Kantian Constructivism. Not only does she present a positive case for her own view, she also attacks existing metaethical positions and even the disctinctions that metaethics has traditionally relied on. This thesis is a sustained examination of this position. I consider whether Korsgaard can legitimately claim to be offering a metaethical position at all, providing her with some defence against the scepticism of some metaethicists. I also examine her attacks on traditional metaethical positions (in particular moral realism and expressivism). I argue that her attack on moral realism can be avoided if the realism on offer takes a particular form. In the case of expressivism I claim that Korsgaard’s attack, though not fully developed in her work, motivates an examination of contemporary hybrid-expressivist theories. I argue that these are, as of yet, no advance over their non-hybrid cousins. Finally I examine Korsgaard’s own position, attempting to make it clearer by combining her claims with a framework developed by Crispin Wright for judgement-dependent qualities. This gives Korsgaard her best chance of a distinctive metaethical position. Ultimately, though, the Neo-Kantian approach to morality fails.

Talents play a central role in the way that we live our lives, and it is widely assumed that identifying and developing one’s talents is valuable, both for oneself and for others. Despite this, the philosophical literature is seriously lacking in its discussion of the nature and value of talent; the objective goodness of talent and its development is often assumed without an analysis of what a talent is, and the value that we place on it. This dissertation aims to provide such an analysis, offering a philosophical account of the nature and value of talent, and an account of why we value its development. In doing so, I demonstrate how this can inform and help us assess the debates and arguments that are made in the existing philosophical literature on talent. I do not aim to provide an exhaustive overview of all the philosophical issues that could be raised in relation to the value of talent and talent development, but instead I focus on three central issues that arise when analysing the nature of talents and the role that they play in our lives. The first issue is the nature of talent itself. Here I offer an account of talent, understood as a high level of potential for a particular skill which is expressed and manifested in the excellent acquisition of that skill. The second issue is whether or not we have good prudential reasons or a moral obligation to develop our talents. I begin by objecting to Kant’s claim that there is a moral duty to develop one’s talents; I will argue that if there is such a duty, it will not be generated by the commitments of Kant’s moral theory. I then argue that whether or not talent development is morally required, or prudentially good, is conditional on one’s endorsement of the commitments that are required to bring about the development of one’s talent. Finally, I turn my focus to the relationship between talents and equality. Given the fact that some people are more talented than others, and the way in which this disrupts levels of social equality, I examine how we ought to counteract the injustice caused by unequal levels of talent. I argue that we ought to adopt the luck egalitarian neutralisation approach, as this most plausibly frames the way in which unequal talents disrupt levels of equality, and why any arising inequalities count as unjust.

In this thesis, I use the work of Friedrich Nietzsche to offer a detailed account of existential sin. I show that existential sin as a form of self-understanding is deeply embedded in the Christian theological tradition, and that Nietzsche’s account of existential sin should be understood as part of this same tradition. In my reading of On the Genealogy of Morality I show that we need to place sin in close relation to bad conscience, guilt and the genealogical method itself. However, despite being grounded in Christian thought and dependent upon the figure of the Christian God in its origin and emergence, I follow Nietzsche in positing that existential sin continues to exist after the death of God. It is by considering sin as not only a form of self-understanding, but also as a cultural memory, that we can make sense of this claim. For Nietzsche existential sin is at its root a mistaken understanding of human nature that has taken hold of us through Christianity. However, I argue that we need to consider existential sin as a socio-historical answer to the ontological problem of meaningless suffering. Existential sin responds to a fundamental experience of the human condition. With this in mind, in the final chapter of the thesis I examine possible avenues of redemption from post-Christian sin. What options are open to the person suffering from post-Christian sin-consciousness if she cannot turn to religious narratives? I argue that Nietzsche’s redemptive method of genealogy is not sufficient, and that life-affirmation is too demanding. However, a weaker version of life-affirmation in which meaningless suffering is affirmed as necessary, but not desired, does provide a promising alternative answer to the problem of meaningless suffering.

This Thesis reconsiders the prospects for an approach to global justice centring on the proposal that every human being should possess a certain bundle of goods, which would include certain members of a distinctive category: the category of capabilities. My overall aim is to present a clarified and well-developed framework, within which such claims can be made. To do this, I visit a number of regions of normative and metanormative theorising. I begin by introducing the motivations for the capability approach, and clarifying some of its most distinctive features. Next, I focus on Martha Nussbaum's version of the approach, and identify several problems therein. The most important concerns epistemology, and especially the challenges that constructivist theories pose. The middle part of the Thesis presents an alternative, based on the work of John McDowell, which I argue has superior prospects. Then, I turn to two further problems: that of making sense of the universalistic aspirations of cosmopolitanism, and that of integrating the microscopic prescriptions of ethics with the macroscopic analyses of political philosophy. Using the Aristotelian interpretation of its core framework that I have developed, I conclude that the capability approach can provide compelling answers to important questions about global justice.