This is the first book in English on the early 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. 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.