For to say that he has a private object means that we shall regard no description which he may give of it as really telling us what its like. We assume
that when he was taught our language the privacy of the object made it impossible to teach him the applications of language to this object. But what if he just had guessed the right application? But which is the right application? There is nothing to guess at. But couldn't he if only by chance have stumbled on the analogical application analogous to the public one? But what are we in this
case to call ‘analogous’?