Chapter 2 discusses the philosophical background of ethics, defining philosophy as the love of wisdom that explores human experiences and the ultimate causes of reality. It outlines various branches of philosophy, including theoretical and practical philosophy, while emphasizing ethics as the study of morality and human conduct. The document further explains distinctions within ethics, including descriptive, normative, and metaethics, as well as insights from philosophers like St. Thomas Aquinas and Sigmund Freud on human moral understanding and development.