 The Manifestation challenge to realism is to isolate some feature of the use agents make of their words, or their mental symbols, which forges the link between mind-independent states of affairs and the thoughts and sentences that represent them. Nothing in the thinker’s linguistic behaviour, according to the anti-realist, provides evidence that this link has been forged—linguistic use is keyed to public assertibility conditions, not undetectable truth-conditions. In those cases, such as the Socrates one, where we cannot find out whether the truth-condition is satisfied or not, it is simply gratuitous to believe that there is anything we can think or say or do which could provide evidence that the link has been set up in the first place. So the anti-realist claims [Dummett 1978, 1991, 1993; Tennant 1987, 1997; Wright 1993].