John Finnis's proposal to rehabilitate Aquinas's natural law theory as an appropriate foundation of legal and moral theory rests on the assumption that Aquinas's theory can be restored by eliminating the mistaken interpretations of subsequent natural law theorists. This book challenges that assumption. After a brief analysis of Aquinas, the theories of Suárez, Grotius, and Pufendorf are investigated. It is argued that their theories are no 'mistakes', but attempts at solving problems inherent in natural law theory. As these attempts all fail, tensions remain, and ultimately lead to the demise of the theory. Finally it is argued that Finnis, running into the same problems, cannot hope to restore Aquinas's theoretical edifice.

Is there such a thing as an objective law of morality? Natural law theorists maintain that there is, and Natural Law probes the history and implications of this powerful concept. Tracing the development of natural law from ancient times to the present, the book also examines the leading figures, transitions, and turning points in the idea's evolution, and brings a natural law approach to contemporary issues such as abortion, homosexuality, and assisted suicide.

In Section 1, I outline the history of natural law theory, covering Plato, Aristotle, the Stoics and Aquinas. In Section 2, I explore two alternative traditions of natural law, and explain why these constitute rivals to the Aristotelian tradition. In Section 3, I go on to elaborate a via negativa along which natural law norms can be discovered. On this basis, I unpack what I call three 'experiments in being', each of which illustrates the cogency of this method. In Section 4, I investigate and rebut two seminal challenges to natural law methodology, namely, the fact/value distinction in metaethics and Darwinian evolutionary biology. In Section 5, I then outline and criticise the 'new' natural law theory, which is an attempt to revise natural law thought in light of the two challenges above. I conclude, in Section 6, with a summary and some reflections on the prospects for natural law theory.

This book offers the first sustained jurisprudential inquiry into Islamic natural law theory. It introduces readers to competing theories of Islamic natural law theory based on close readings of Islamic legal sources from as early as the 9th and 10th centuries CE. In popular debates about Islamic law, modern Muslims perpetuate an image of Islamic law as legislated by God, to whom the devout are bound to obey. Reason alone cannot obligate obedience; at most it can confirm or corroborate what is established by source texts endowed with divine authority. This book shows, however, that premodern Sunni Muslim jurists were not so resolute. Instead, they asked whether and how reason alone can be the basis for asserting the good and the bad, thereby justifying obligations and prohibitions under Shari'a. They theorized about the authority of reason amidst competing theologies of God. For premodern Sunni Muslim jurists, nature became the link between the divine will and human reason. Nature is the product of God's purposeful creation for the benefit of humanity. Since nature is created by God and thereby reflects His goodness, nature is fused with both fact and value. Consequently, as a divinely created good, nature can be investigated to reach both empirical and normative conclusions about the good and bad. They disagreed, however, whether nature's goodness is contingent upon a theology of God's justice or God's potentially contingent grace upon humanity, thus contributing to different theories of natural law. By recasting the Islamic legal tradition in terms of legal philosophy, the book sheds substantial light on an uncharted tradition of natural law theory and offers critical insights into contemporary global debates about Islamic law and reform.

This impressive volume is the first attempt to look at the intertwined histories of natural law and the laws of nature in early modern Europe. These notions became central to jurisprudence and natural philosophy in the seventeenth century; the debates that informed developments in those fields drew heavily on theology and moral philosophy, and vice versa. Historians of science, law, philosophy, and theology from Europe and North America here come together to address these central themes and to consider the question; was the emergence of natural law both in European jurisprudence and natural philosophy merely a coincidence, or did these disciplinary traditions develop within a common conceptual matrix, in which theological, philosophical, and political arguments converged to make the analogy between legal and natural orders compelling. This book will stimulate new debate in the areas of intellectual history and the history of philosophy, as well as the natural and human sciences in general.

If there is any one author in the history of moral thought who has come to be associated with the idea of natural law, it is Saint Thomas Aquinas. Many things have been written about Aquinas's natural law teaching, and from many different perspectives. The aim of this book is to help see it from his own perspective. That is why the focus is metaphysical. Aquinas's whole moral doctrine is laden with metaphysics, and his natural law teaching especially so, because it is all about first principles. The book centers on how Aquinas thinks the first principles of practical reason, which for him are what make up natural law, function as laws. It is a controversial question, and the book engages a variety of readers of Aquinas, including Francisco Suarez, Jacques Maritain, prominent analytical philosophers, Straussians, and the initiators of the New Natural Law theory. Among the issues addressed are the relation between natural law and natural inclination, how far natural law depends on knowledge of human nature, what its obligatory force consists in, and, above all, how it is related to what for Aquinas is the first principle of all being, the divine will.

A fresh look at the importance of natural and international law in the religious politics at the heartlands of the Reformation, from the Low Countries, the German principalities up to Transylvania; from Niels Hemmingsen to Gian Battista Vico; from religious reasons for the universalist claims of natural law to political arguments for the sacred polity, their tension and creative potential.