On the Genealogy of Morals, written in 1887, showcases Friedrich Nietzsche's use of philosophy, psychology, and classical philology to offer new directions to ancient ethical inquiries. This work is divided into three essays, each exploring different aspects of morality and its origins. The first essay delves into the contrast between master morality and slave morality, highlighting the diverse meanings of "good" in each context. The second essay investigates the concepts of guilt and the bad conscience, while the third essay examines ascetic ideals not only in religion but also in the academic realm.

Ecce Homo, Nietzsche's autobiographical review of his life and works, was written in 1898 and first published posthumously in 1908. It provides chapters on all the books he published, offering his interpretations which are both fascinating and invaluable. This edition, translated and annotated by renowned Nietzsche scholar Walter Kaufmann, presents Nietzsche's most clear and thorough expression of his psychological philosophy.