  Is the argument compelling? Tolhurst suggests that the best option for those who want to resist it is to postulate “the existence of a special ability to ascertain […] moral truth” (614, see Wright 1992, 152–156, for a related suggestion). For that would allow one to hold that there are relevant respects in which we may differ from our possible opponents, besides those concerning our non-moral beliefs and (general) reasoning skills. In the ensuing discussion, Tolhurst notes that, by postulating a special ability, realists would “incur a significant theoretical debt” (621), but he holds open whether they can make good on it.