The central text of contemporary natural law theory remains John Finnis's Natural Law and Natural Rights. In that respect, it is a field in need of reinvigoration. The comparison with legal positivism, natural law theory's modern counterpoint, is instructive. Although the paradigmatic positivist text is still H. L. A. Hart's The Concept of Law, Hart's theory has largely been superseded in current debates within positivism, most notably by the (arguably more philosophically sophisticated) writings of his erstwhile student, Joseph Raz. The current vibrancy of the positivist tradition owes much to this changing of the guard.Mark Murphy's recent book, Natural Law in Jurisprudence and Politics, provides perhaps the best hope yet for a similar development within natural law theory. Murphy's writing is clear, elegant and precise; in fewer than 200 pages, he covers the central questions confronting the natural law view, including the definition of law, the nature of the common good, the basis of political authority and the legitimacy of legal punishment. On each of these points Murphy clearly frames and contextualizes his position, systematically considers leading alternatives and carefully explains his positive argument. He is honest and clear-headed about shortcomings in and challenges to his theory, acknowledging openly where there is further work to be done.The book is rigorous and sophisticated without being overly technical; it represents the best in philosophical style. There is a great deal of interest here for specialists (for whom the work is primarily intended); however, the text would not be out of place as the basis for an advanced undergraduate course in the area, such is its clarity and breadth of coverage. Murphy's natural law view combines philosophical resourcefulness with a strong adherence to the core elements of the tradition. He draws significantly on key classical (Aristotle, Aquinas) and contemporary (Finnis) theorists; but his argument also exhibits considerable innovation — he departs significantly from all the above figures on key points.An overview of Murphy's natural law theory is provided in the following section 2. As I have indicated, there is much to admire in Murphy's argument; my main aim in this article, however, is to focus on my points of disagreement. These fall into three main areas: Murphy's rejection of Finnis's hermeneutic strategy for defining law (section 3); his views on the claims of law and the foundations of political authority (section 4); and his (qualified) defence of the common good principle against the challenge from the super-political (section 5). By considering these points, I hope to illustrate what Murphy's work has to offer as a focal point for future debates in natural law theory — as well as venturing my own modest contribution.
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