The starting point of this book is the question of to what extent knowledge can be objectively justified and to what extent our statements, in their claim to be true, must necessarily presuppose a reference to a world given independently of our subjective experience. Overall, it is to be shown that, first, every theory of truth must in some way be based on correspondence-theoretical assumptions (i.e., truth is the agreement of a statement or thought with reality). Second, however, that eve...