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" – An investigation into human cognition. Important statements of Skepticism.
Book 2: "Of the Passions" – A treatment of emotions and free will.
Book 3: "Of Morals" – A treatment of moral ideas, justice, obligations, benevolence.