This is the first book in English on the major works of the German philosopher Johann Gottlieb Fichte (1762-1814). It examines the transcendental theory of self and world from the writings of Fichte's most influential period (1794-1800), and considers in detail recently discovered lectures on the Foundations of Transcendental Philosophy. At the center of that body of work stands Fichte's attempt to integrate the theories of volition and cognition into a unified but complex 'system of freedom'. The focus of this book is the intricate interplay between thinking and willing in the birth of experience out of the spirit of freedom. Combining incomparable erudition, sensitive readings of some of the most difficult of philosophical texts, clarity in exposition and an acute awareness of historical context this book takes its place as the ideal introduction to Fichte's thought.