The aim of this book is to show that the world, including human beings and their consciousness, is not originally a world of thing but a world of words; that fundamentally the world has the structure of a text; and that it is therefore possible to read it like a test (Georg Kühlewind). To realize this goal one must keep in mind three different approaches, or disciplines: epistemology, psychology, and linguistics. These are united by the phenomenology - "empiricism of consciousness" - used by the author, who always speaks from and toward experience. This is no ordinary text. It is a guide to philosophical experience - to the experience of cognition itself.