 In his 1964 book The Morality of Law, Fuller formulated principles of what he called “the inner morality of law”—principles requiring that laws be general, public, prospective, coherent, clear, stable, and practicable—and he argued that these were indispensable to law-making. Reviewing Fuller’s book, H.L.A. Hart (1965) asked in what sense these principles could be called a “morality”. They seemed to be more like instrumental principles for effective legislation, and on Hart’s view, they were only as moral as the enterprise they made possible. 