The purpose of is to place Thomas Aquinas's moral theory in its full philosophical and theological context and to do so in a way that makes Aquinas (1224/5-1274) readily accessible to students and interested general readers, including those encountering Aquinas for the first time. Rebecca Konyndyk DeYoung, Colleen McCluskey, and Christina Van Dyke begin by explaining Aquinas's theories of the human person and human action, since these ground his moral theory. In their interpretation, Aquinas's theological commitments crucially shape his account of the human person, human capacities for action, and human flourishing. The authors develop a comprehensive picture of Aquinas's thought, which is designed to help students understand how his concept of happiness and the good life are part of a coherent, theologically-informed worldview.