  Dworkin's idea that modern political societies can be seen as communities of principle is grounded in his emphasis on judicial institutions as the core institutions of modern political societies and his account of legal interpretation. His view is that judges interpret the law by creating a coherent account of as much of the black letter law as possible and by interpreting that black letter law in terms of principles that make the law be the best that it can be. Hence, judges aim at producing a coherent account of the law overall by grounding it in the best basic moral principles that it can be grounded in. From this he thinks of modern societies as being concerned to elaborate common principles by which the society can be guided.