Jonathan Israel presents the first major reassessment of the Western Enlightenment for a generation. Continuing the story he began in the best-selling Radical Enlightenment, and now focusing his attention on the first half of the eighteenth century, he returns to the original sources to offer a groundbreaking new perspective on the nature and development of the most important currents in modern thought.

Israel traces many of the core principles of Western modernity to their roots in the social, political, and philosophical ferment of this period: the primacy of reason, democracy,...

Spinoza's Theological-Political Treatise (1670) is one of the most important philosophical works of the early modern period. In it Spinoza discusses at length the historical circumstances of the composition and transmission of the Bible, demonstrating the fallibility of both its authors and its interpreters. He argues that free enquiry is not only consistent with the security and prosperity of a state but actually essential to them, and that such freedom flourishes best in a democratic and republican state in which individuals are left free while religious organizations are subordinated to...