[Several earlier essays in this journal have explored questions such as whether it is possible to speak of intercultural dialogue about the common good in an era of globalization, or whether one can even seek a “global ethics.” These questions are more poignant and critical since the tragic events of September 11, 2001. The author here argues that a revised concept of the common good can still be useful. She brings to bear on global ethics some aspects of Aquinas’s view of practical reason, especially its historical contextuality and its interdependence with moral virtue.]