A Treatise of Human Nature / Being an Attempt to Introduce the Experimental Method Into Moral Subjects; and Dialogues Concerning Natural Religion

A sustained philosophical investigation that applies an experimental method to human mental life, arguing that ideas derive from sensory impressions and mental reflection, explaining association of ideas, habit-based causal inference, and skeptical limits on knowledge. It examines personal identity as a bundle of perceptions, analyzes passions and their role in motivating action, and develops a sentimentalist account of moral judgment grounded in feeling rather than reason. The work also includes critical discussion of religion, presenting skeptical dialogues that question design arguments and divine attributes. Overall it combines epistemology, psychology, ethics, and religion to map how humans form beliefs and values.