David Hume's Treatise of Human Nature, composed before the author was twenty-eight years old, was published in 1739 and 1740. In revising the late L.A. Selby-Bigge's edition of Hume's Treatise Professor Nidditch corrected verbal errors and took account of Hume's manuscript amendments. He also supplied the text of theof the Treatise following the original 1740 edition and provided an apparatus of variant readings.

Elaborates an ethic in which beneficence on a personal and communal level has moral force; proposes the idea of an interplay between compassion and reason to help address moral problems; and sketches the conditions necessary for a democratic approach to such problems.