 Returning to  (1),  let’s consider what Austin says about the conditions in which a subject would fail to know. Austin’s discussion is haunted by the following condition: “If I know, I can’t be wrong”. He never quite endorses the condition. He admits at one point that its third person counterpart makes sense, but characterizes the sense it makes by appeal to a prohibition on saying “I know it is so, but I may be wrong” (1946: 98).