The diversity of contemporary moral debate and its interminability are indeed mirrored in the controversies of analytical moral philosophers. But if those who claim to be able to formulate principles on which rational moral agents ought to agree cannot secure agreement on the formulation of those principles from their colleagues who share their basic philosophical purpose and method, there is once again prima facie evidence that their project has failed, even before we have examined their particular contentions and conclusions. Each of them in his criticism offers testimony to the failure of
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