Terence Cuneo

Speech, I maintain, is a thoroughly normative phenomenon: one performs speech acts such as asserting, promising, and commanding, I claim, by altering one’s normative position with regard to one’s audience, acquiring rights, responsibilities, and obligations of various sorts.

necessary condition for the possibility of speech is that there be moral facts of certain kinds.

In my judgment, if there were no moral facts then we would not be able to speak.