Book excerpt: The eminent political theorist’s classic lectures on the history of political philosophy and the problems of historicism and relativism. Leo Strauss is known for reviving classical political philosophy through careful analyses of works by ancient thinkers. As with his published writings, Strauss’s seminars were notoriously dense, accessible only to graduate students and scholars. In 1965, however, Strauss offered an introductory course on political philosophy at the University of Chicago. Using a conversational style, he sought to make political philosophy, as well as his own ideas and methods, understandable to those with little background on the subject. Leo Strauss on Political Philosophy brings together the lectures that comprise Strauss’s “Introduction to Political Philosophy.” Strauss begins by arguing that the proper aim of political philosophy is to determine the common good in society. He then critiques the theories of positivism and historicism, the two most powerful challenges to this intellectual project. These lectures range across the history of political philosophy, providing a valuable, thematically coherent foundation, including explications of many canonical thinkers, such as Plato, Aristotle, Auguste Comte, and Immanuel Kant.