The philosophy of Aristotle remains a beacon of our culture. But no part of Aristotle's work is more alive and compelling today than his contribution to ethics and political science — nor more relevant to the subject of the present volume. Political science, in his view, begins with ethics, and the primary task of ethics is to elucidate human flourishing. Aristotle brings to this topic a mind unsurpassed in the depth, keenness, and comprehensiveness of its probing.