Frequently, a genuine understanding of a thinker's ideas is possible only by following them further than he did himself. Wittgenstein's Viennese contemporary Karl Kraus spoke in a similar context of one-and-a-half truths in contradistinction to half-truths. In this volume of essays, Jaakko Kintikka examines in the spirit of Kraus's bon mot the two grand visions concerning the interrelations of language, self and the world that guided Wittgenstein's thought at the different stages of his philosophical development.