Aquinas's discussions of moral issues are extensive, and range well beyond the narrowly defined set of issues in the modern tradition of moral philosophy. This volume explores the ethical dimensions of a wide selection of philosophical and theological topics in Aquinas's texts. It covers topics central to ethics, such as happiness, moral virtue, and natural law, as well as related topics pertaining to the metaphysical basis of Aquinas's account of goodness, the ramifications of his ethical concerns for his philosophy of language, and the significance of his philosophical psychology for his ethics.