 Error theorists must be prepared to defend themselves on both fronts. This job is made difficult by the fact that it may be hard to articulate precisely what it is that is so troubling about morality. This failure need not be due to a lack of clear thinking or imagination on the error theorists’ part, for the thing that is troubling them may be that there is something deeply mysterious about morality. The moral error theorist may, for example, perceive that moral imperatives are imbued with a kind of mystical practical authority—a quality that, being mysterious, of course cannot be articulated in terms satisfactory to an analytic philosopher. Such an error theorist is forced to fall back on vague metaphors in presenting their case: Moral properties have a “to-be-pursuedness” to them (Mackie 1977: 40), moral facts would require that “the universe takes sides” (Burgess [1978] 2007), moral believers are committed to “demands as real as trees and as authoritative as orders from headquarters” (Garner 1994: 61), and so on. Indeed, it may be the vague, equivocal, quasi-mystical, and/or ineliminably metaphorical imponderabilia of moral discourse that so troubles the error theorist. (See Hussain 2004.)