In the spring of 1941, as Hitler was laying plans for his invasion of the Soviet Union, Leo Strauss gave a lecture at the New School for Social Research as part of a seminar on “Experiences of the Second World War.” The lecture, which was not published until five decades later, marked one of the rare occasions on which the philosopher discussed current events in the classroom. Strauss had arrived in the United States five years earlier, and at the New School he was part of a faculty filled with academic refugees, few of whom shared his conservative politics. But his lecture was not primarily about the war. He instead had in view a problem that he feared was obscured by the conflict and the ideological mindset it encouraged. Strauss’s theme was education, and the place of liberal education in societies engaged in an existential struggle to preserve their way of life.