Abbreviations, Citational Shortcuts, and a Note on TranslationPrefaceIntroduction: When Spinoza Met Marx, Or Activity In A Nonhumanist Key1 The Headless Revolution: Heinrich Heine's Ethos Of "Vigorous Repose"2 Love And Friendship: Berthold Auerbach And Moses Hess On Understanding And Activity3 When Marx Met Spinoza: Determination, Contingency, And Substance4 Spinoza Against Bismarck, Or Johannjacoby And The Pursuit Of Monist Democracy5 An Ethics Of Natural Necessity: Jakob Stern, Free Thought, And German Social Democracy6 What Is "Nature"? Georgi Plekhanov And The Dilemmas Of Consistent MaterialismConclusion: The Persistence Of Vigorous ReposeAcknowledgmentsNotesBibliographyIndex