It is widely accepted that in uttering sentences we sometimes perform distinctive kinds of acts. We declare, assert, challenge, question, corroborate by means of speech; sometimes we also use speech to perform acts such as promising, commanding, judging, pronouncing, and christening. Yet it seems that in order to perform an act of, say, promising, one must have a certain kind of normative status; at the very least, one must be accountable. Similarly, in order to issue a command, one must, in some sense, have the authority to do so. It seems, then, that the power to perform acts by means of speech depends upon the normative status and standing of speakers.

In Speech and Morality: On the Metaethical Implications of Speaking (Oxford University Press, 2014), Terence Cuneo appeals to this fact in devising an original and compelling argument for moral realism. He claims that were it not for the existence of moral facts, we would not be able to perform ordinary speech acts such as promising. As we clearly do perform such acts, there must be moral facts. That’s the simple argument that lies at the heart of Cuneo’s fascinating book.
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