His literary work includes a novel about Oliver Alden, The Last Puritan.  
His last major book was a set of "reflections on liberty, society, and government," Dominations and Powers.  He wrote about Lucretius, Dante, and Goethe in Three Philosophical Poets and divided reality into the four realms of matter, spirit, truth, and essence in his magnum opus.  His literary work includes a novel about Oliver Alden, The Last Puritan.  For 10 points - name this American philosopher of The Life of Reason and Scepticism and Animal Faith, who accused those who forget history of being condemned to repeat it.
His last major book was a set of "reflections on liberty, society, and government," Dominations and Powers.  
George Santayana