The aim of this article is neither to challenge nor to defend Isaiah Berlin’s thought but rather to identify the main influences on his concept of liberalism. Berlin’s justification for liberalism is distinctive in that it reflects influences of Romanticism and Augustinianism. Unlike some liberals, his liberalism does not reflect unambiguous confidence in the products of the Enlightenment. Berlin valued the freedom of expression and identity, yet he feared that these freedoms faced potential threats from both left and right. These (...) considerations led Berlin to found his liberalism on the notion of limited government, as is reflected in his bias towards negative, rather than positive, liberty. Negative liberty implies restraint on the part of the state in order to limit anything that might act as an impediment to individual freedom. In contrast, positive liberty implies that the state may have to be active even to the point of imposing restrictions on individual freedom in order to ameliorate effective limits on liberty imposed as a consequence of societal inequities. Berlin is justly deemed to have been one of the great political theorists of the twentieth century. Few, even among his critics, would deny this, and even those who disagree with Berlin’s conclusions would acknowledge that his framing of the questions and his references to history have elevated and enriched the debate on liberalism. (shrink)