**"Among the important books in the history of American legal
philosophy. It includes insights into the relations between morality and
law, and advances a theory of law of great practical relevance. . . .
[This] is the best discussion of the demands of the rule of law in
existing literature."--Robert S. Summers, Journal of Legal
Education
"Throughout this profound, imaginative and keenly analytical work,
[Fuller] demonstrates his continuing concern with the tension in
morality and law between the 'is' and the 'ought'. . . . A book of ideas
should . . . provoke and contribute new thoughts. This book does
both."--Barry R. Mandelbaum, New York Law Forum
In this classic work the legal philosopher Lon L. Fuller explores the
relationship between law and morality, distinguishing between the
morality of duty and the morality of aspiration.