Book 2 applies Hume's principles of ideas and impressions on human feelings to explain how our passions, such as love, hatred, envy, and anger are generated by the relation of pain and pleasure to our ego. It also discusses the foundation of property, beauty, utility, and riches, which are explained further in Book 3.
Juan is the founder of Superphysics, derived entirely from Adam Smith and David Hume. http://superphysics.one