In this book, Stewart Clem develops an account of truthfulness that is grounded in the Thomistic virtue of veracitas. Unlike most contemporary Christian ethicists, who narrowly focus on the permissibility of lying, he turns to the virtue of truthfulness and illuminates its close relationship to the virtue of justice. This approach generates a more precise taxonomy of speech acts and shows how they are grounded in specific virtues and vices. Clem's study also contributes to the contemporary literature on Aquinas, who is often classified alongside Augustine and Kant as holding a rigorist position on lying. Meticulously researched, this volume clarifies what set Aquinas's view apart in his own day and how it is relevant to our own. Clem demonstrates that Aquinas's account provides a genuine alternative to rigorist and consequentialist approaches. His analysis also reveals the perennial relevance of Aquinas's thought by bringing it to bear on contemporary social and ethical issues.