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How should a judge's moral convictions bear on his judgments about what the law is? Lawyers, sociologists, philosophers, politicians, and judges all have answers to that question - these range from 'nothing' to 'everything'. In this book, Ronald Dworkin argues that the question is much more complex than it has often been taken to be and charts a variety of dimensions - semantic, jurisprudential, and doctrinal - in which law and morals are undoubtedly interwoven. He restates and summarizes his own widely discussed account of these connections, which emphasizes the sovereign importance of moral principle in legal and constitutional interpretation, and then reviews and criticizes the most influential rival theories to his own. He argues that pragmatism is empty as a theory of law, that value pluralism misunderstands the nature of moral concepts, that constitutional originalism reflects an impoverished view of the role of a constitution in a democratic society, and that contemporary legal positivism is based on a mistaken semantic theory and an erroneous account of the nature of authority.