The present collection of writings includes all the most critical works of Spinoza, including the Theologico-Political Treatise, the Political Treatise, the Ethics, "On the Improvement of the Understanding," and a collection of Spinoza's Correspondence. It was originally published as two volumes in 1884, and is here reformatted into a single volume. From the Introduction: "Spinoza conceived as a vast unity all existence actual and possible; indeed, between actual and possible he recognizes no distinction, for, if a thing does not exist, there must be some cause which prevents its existing, or...