Isaiah Berlin is regarded by many as one of the greatest historians of ideas of his time. In The Crooked Timber of Humanity, he argues passionately, eloquently, and subtly, that what he calls ‘the Great Goods’ of human aspiration – liberty, justice, equality – do not cohere and never can. Pluralism and variety of thought are not avoidable compromises, but the glory of civilisation. In an age of increasing ideological fundamentalism and intolerance we need to listen to Isaiah Berlin more carefully than ever before.