Kontrowersje interpretacyjne wypowiedzi typu „Nie sądzę, że p, ja to wiem.”

The subject of the paper are such types of utterances as Nie sądzę, że p, ja to wiem (I don t believe that p, I know it). In particular, interpretive controversies of this kind of utterances are discussed. The applied research method consists in a comparative analysis of the collected language material. Moreover, the present-ed extensive empirical material confirms the thesis that such utterances are indeed corrective. The conclu-sions from the analyses support the thesis that the classical definition of knowledge (of justified true belief) is internally contradictory due to the fact that verb wiedzieć, że_ (know that_) is defined by a non-factive verb być przekonanym, że_ (be convinced that_).