A Treatise of Human Nature is a book by Scottish philosopher David Hume, first published in 1739-1740.The full title of the Treatise is 'A Treatise of Human Nature: Being an Attempt to introduce the experimental Method of Reasoning into Moral Subjects'. It contains the following sections:Book 1: "Of the Understanding" - A treatment of everything from the origin of our ideas to how they are to be divided. Important statements of Scepticism. Book 2: "Of the Passions" - A treatment of emotions and free will. Book 3: "Of Morals" - A treatment of moral ideas, justice, obligations, benevolence. Excerpted from Wikipedia, the free encyclopedia.