Spinoza's Theologico-Political Treatise is simultaneously a work of philosophy and a piece of practical politics. It defends religious pluralism, a republican form of political organisation, and the freedom to philosophise, with a determination that is extremely rare in seventeenth-century thought. But it is also a fierce and polemical intervention in a series of Dutch disputes over issues about which Spinoza and his opponents cared very deeply.Susan James makes the arguments of the Treatise accessible, and their motivations plain, by setting them in their historical and philosophical context.