Isaiah Berlin's celebrated radio lectures on six formative anti-liberal thinkers were broadcast by the BBC in 1952. They are published here for the first time, fifty years later. They comprise one of Berlin's earliest and most convincing expositions of his views on human freedom and on the history of ideas - views that later found expression in such famous works as "Two Concepts of Liberty," and were at the heart of his lifelong work on the Enlightenment and its critics. Working with BBC transcripts and Berlin's annotated drafts, Henry Hardy has recreated these lectures, which consolidated the forty-three-year-old Berlin's growing reputation as a man who could speak about intellectual matters in an accessible and involving way.In his lucid examination of sometimes complex ideas, Berlin demonstrates that a balanced understanding and a resilient defense of human liberty depend on learning both from the errors of freedom's alleged defenders and from the dark insights of its avowed antagonists. This book throws light on the early development of Berlin's most influential ideas and supplements his already published writings with fuller treatments of Helvetius, Rousseau, Fichte, Hegel, and Saint-Simon, with the ultra-conservative Maistre bringing up the rear. These thinkers gave to freedom a new dimension of power - power that, Berlin argues, has historically brought about less, not more, individual liberty.These lectures show Berlin at his liveliest and most torrentially spontaneous, testifying to his talents as a teacher of rare brilliance and impact. Listeners tuned in expectantly each week to the hour-long broadcasts and found themselves mesmerized by Berlin's astonishingly fluent extempore style. One listener, a leading historian of ideas who was then a schoolboy, was to recount that the lectures "excited me so much that I sat, for every talk, on the floor beside the wireless, taking notes." This excitement is at last recreated here for all to share.

以赛亚·伯林(1909—1997)　英国哲学家和政治思想史家,20世纪最著名的自由主义知识分子之一。出生于俄国里加的一个犹太人家庭,1920年随父母前往英国。1928年进入牛津大学攻读文学和哲学,1932年获选全灵学院研究员,并在新学院任哲学讲师,其间与艾耶尔、奥斯汀等参与了普通语言哲学的运动。二战期间,先后在纽约、华盛顿和莫斯科担任外交职务。1946年重回牛津教授哲学课程,并把研究方向转向思想史。1957年成为牛津大学社会与政治理论教授,并获封爵士。1966年至1975年担任牛津大学沃尔森学院院长。主要著作有《自由四论》（1969，后扩充为《自由论》）、《俄国思想家》(1978)、《反潮流》(1979)、《个人印象》(1980)、《扭曲的人性之材》（1990）、《现实感》(1996)、《浪漫主义的根源》（1999）、《启蒙的三个批评者》（2000）、《苏联的心灵》（2004）等。