This book brings together for the first time three major studies from Isaiah Berlin's central intellectual project - to explain the opposition to the excessively scientific French Enlightenment by getting under the skin of its critics and giving a sympathetic account of their views. The contributions of these particular critics could hardly be more important. Giambattista Vico estabished that the humanties are and must remain crucially different from the sciences: J G Herder - sometimes called the father of European nationalism - originated populism, expressionism and pluralism (an idea which Berlin enriched and made powerfully his own); and the anti-rationalist J G Hamann lit the fuse of romanticism, the major movement to arise out of the various currents of hostility to Enlightenment thought. The issue between the advocates of the Enlightenment and these critics is today at least as fundamental as it was in its beginnings. With his customary humane understanding, Berlin analyses the ideas of three deeply original but unregarded thinkers, and demonstrates their disturbing relevance to the central issues of today's world.