Analysis of the Concept of Knowledge from the Viewpoint of Later Wittgenstein

Through his last writing, A Book on the Certainty, Wittgenstein analyzes the concept of knowledge. He disagrees with the Moor’s idea that says “I know this is a hand.” From Wittgenstein’s viewpoint, the concept of knowledge has its own conditions and qualifications; without them the knowledge is not reachable. Therefore, since the propositions indicated by Moor miss those qualifications, the concept of knowledge based on those propositions is incorrect and meaningless. For Wittgenstein, the inability to apply the concept of knowledge for those propositions does not bring about uncertainty, fault or ignorance, but it secures the notion of certainty. Those prepositions, besides many experimental prepositions, illustrate our world- image. Our world- image is the basis of our certain knowledge which is not in the form of the concept of theoretical knowledge but it is in the form of the concept of practical knowledge. Consequently, not only doubt and uncertainty do not belong to the realm of the world- image, but also based on this form of certain concept the concept of uncertainty can have a meaning.