 For another line of attack against the coherence of unrestricted quantification, one may ask what exactly is a domain of quantification supposed to be. Skeptics often take a page from modern model theory and think of a domain of quantification as a set—or at least as a set-like object, which contains as members all objects over which the putatively unrestricted quantifier is supposed to range. They take for granted that for a speaker to be able to quantify over some objects, they must all be members of some set-like object, which constitutes a domain of quantification. Cartwright (1994) called this thesis the All-in-One Principle. Now, if there is unrestricted quantification, then the domain of quantification associated to it cannot be a set-like object. For we could then deploy a suitable variation on Russell’s paradox in order to obtain a  contradiction.[24]  Many have concluded from this that there is no genuinely unrestricted quantification over all objects at once.