Hume's Treatise of Human Nature contains his initial exposition of his theory of the passions and morals. He later published an edited account of the former in A Dissertation on the Passions. An Enquiry Concerning the Principles of Morals is Hume's mature statement of his moral theory and the work that he believed to be his best. Although the above works include some material relevant to his aesthetics and political philosophy, the Essays, Moral, Political and Literary contain lengthier discussions of these aspects of Hume's thought. Also relevant, particularly to Hume's political views, is his History of England. The Clarendon Press has published critical editions of the Treatise (Norton & Norton 2007), the Enquiry Concerning the Principles of Morals (Beauchamp 2006), and the Dissertation on the Passions (together with The Natural History of Religion) (Hume 2007). Liberty Fund offers editions of both the Essays (Miller 1987) and History of England (Todd 1983).