Book excerpt: Available for the first time in the English language, this is a complete and annotated translation of a key work by the twelfth-century Muslim philosopher, Averroes (Ibn Rushd). Acknowledged as the leading transmitter of Aristotelian th ought, Averroes also held controversial views about the re lationship between faith and reason, arguing that religion should not be allowed to impose limits on the exercise of rational thought. His theory of rationality, along with others on language, justice and the interpretation of religious texts, is clearly presented here, in a work that provides the most comprehensive picture available of Averroes's great intellectual achievements.