This lecture was given at the Goethe University Frankfurt/Main under the auspices of the Cluster of Excellence on the Formation of Normative Orders on 1 July 2009. For their helpful comments I would like to thank Rainer Forst, Eva Buddeberg, Nikita Dhawan, Axel Honneth, Anthony Laden, Robert Nichols, David Owen, Jonathan Pugh and Henry Richardson. The lecture is based on my Public Philosophy in a New Key, 2 volumes (Cambridge 2008).
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