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Philosophers since ancient times have pondered how we can know whether moral claims are true or false. The first half of the twentieth century witnessed widespread skepticism concerning the possibility of moral knowledge. Indeed, some argued that moral statements lacked cognitive content altogether, because they were not susceptible to empirical verification. The British philosopher A. J. Ayer contends that 'They are pure expressions of feeling and as such do not come under the category of truth and falsehood. They are unverifiable because they do not express genuine propositions.' The second half of the twentieth century brought a revival of interest among philosophers in moral and political questions. Whether or not ethics can be founded upon a rational basis continues to preoccupy the philosophical community even now

In the area of moral epistemology, there is an interesting problem facing the person in my area, ancient philosophy, who hopes to write a historical paper which will engage with our current philosophical concerns. Not only are ancient ethical theories very different in structure and concerns from modern ones (though with the rapid growth of virtue ethics this is becoming less true), but the concerns and emphases of ancient epistemology are very different from those of modern theories of knowledge. Some may think that they are so different that they are useful to our own discussions only by way of contrast. I am more sanguine, but I am quite aware that this essay's contribution to modern debates does not fall within the established modern traditions of discussing moral epistemology.

Moral knowledge disappears -- A "science of ethics"? -- G.E. Moore: from science of ethics to nihilism -- Emotivism: the erasure of moral knowledge -- A rational form of noncognitivism? "Rational necessity relocated" -- A consensus of rational people: social constructionism in Rawls -- Practices, traditions, and narratives: social constructionism in MacIntyre -- Prospects for a return of moral knowledge