In Nicomachean Ethics and Politics--both excerpted here--Aristotle attempted to delineate the ideal virtues of a both public and private life as well as critique the utopian antipolitics of his former teacher, Plato. For Aristotle, life in a polis was the natural state of man and provided the greatest opportunity for human beings to fulfill their potential. Unlike his scientific theories, which would eventually be displaced by Galileo, Newton, and Darwin, Aristotle's meticulous thinking on the nature of human affairs, ethics, politics, citizenship, and virtue in a civil society remains as vital today as it was in his own time.