Yale professor Tamar Gendler continues her Philosophy and the Science of Human Nature course with a close reading of Aristotle on virtue. She argues that for Aristotle it is not enough to act as a virtuous person would; one must knowingly choose the virtuous act for its own sake, from a stable character, and take pleasure in doing so. Gendler brings in Julia Annas's suggestion that Mihalyi Csikszentmihalyi's concept of flow helps explain what it means to take pleasure in virtuous action. The lecture closes with John Doris's situationist critique of virtue ethics, which uses experimental psychology to question whether stable character traits actually exist. Chapters move from Aristotle's requirements for virtue, to Annas and flow around the sixteen minute mark, to the Doris critique after thirty five minutes. Recorded in Spring 2011 as part of Yale's Open Yale Courses series.