Is the Common Good of Political Society Limited and Instrumental?

Through a careful discussion of the relevant texts in De Regno and the Summa Theologiae, the author argues that Aquinas understands the political common good to include the full virtue and complete happiness of all of the citizens, as related to one another by bonds of justice and civic friendship. It is not something limited and instrument, as John Finnis has recently argued. Yet that the common good has this character for Aquinas does not imply that he regards political authority as in principle unlimited, on account of a variety of resources available to Aquinas from Aristotelian political theory