No experience can ever be self-validating even though the subjective sense of incorrigibility can increase without limit. As experience there is always a fringe of doubt in its implicit horizon and even when that fringe is entirely exposed and reincorporated within the subject, other forms of validation remain open. Only something which is not and can never be an experience could participate in a certainty without lines of fracture, and what this is must then be without effects in the shared reality.