MOHAMMAD FADEL, an associate law professor at the University of Toronto, is one of North America's most thoughtful commentators on the interface between Islam, liberal democracy and Western understandings of the rule of law. He has made an elaborate case for the possibility of Muslims, including theologically conservative ones, finding a comfortable place in a diverse, noisy liberal democracy where many value systems co-exist. He draws on the ideas of John Rawls, perhaps the greatest American political philosopher of the late 20th century, to show that “public reason” can serve as a kind of common denominator between citizens with utterly different world views.