This newly translated and streamlined compilation of the texts on prudence, justice, fortitude, and temperance from the Summa Theologica II-II follows the question-and-answer format of the original while omitting almost all appeals to authority. Minor objections and replies have also been omitted. A general Introduction to the moral thought of Thomas Aquinas, introductory notes on the texts, an extensive glossary of key terms, and a selective bibliography supplement the texts.