Thomas Aquinas is generally acknowledged to be the greatest theologian of the Middle Ages and his masterpiece, 'Summa Theologica', provides a complete and authoritative statement of medieval economic thought that has remained the official Catholic view right up to the present time. St Thomas had a decisive influence on economic thought in at least three broad areas: the theory of private property, the theory of the just price and the doctrine of usury. St Thomas's great contribution to economic thought, as to theology, moral philosophy, and politics, lies in his emphasis on ratiocination on the Greek ideal of accepting nothing unless good reasons can be given for it.

A study of Aquinas's theory of self-knowledge, situated within the mid-thirteenth-century debate and his own maturing thought on human nature.

Ptolemy, considered a proto-Humanist by some, combined the principles of Northern Italian republicanism with Aristotelian theory in his De Regimine Principum, a book that influenced much of the political thought of the later Middle Ages, the Renaissance, and the early modern period. He was the first to attack kingship as despotism and to draw parallels between ancient Greek models of mixed constitution and the Roman Republic, biblical rule, the Church, and medieval government. In addition to his translation of this important and radical medieval political treatise, written around 1300, James M. Blythe includes a sixty-page introduction to the work and provides over 1200 footnotes that trace Ptolemy's sources, explain his references, and comment on the text, the translation, the context, and the significance.

The De Malo represents some of Aquinas' most mature thinking on goodness, badness, and human agency. In it he examines the full range of questions associated with evil: its origin, its nature, its relation to good, and its compatibility with the existence of an omnipotent, benevolent God. This edition offers Richard Regan's new, clear readable English translation, based on the Leonine Commission's authoritative edition of the Latin text. Brian Davies has provided an extensive introduction and notes. (Please note: this edition does not include the Latin text).

St Thomas Aquinas (1225-1274) saw religion as part of the natural human propensity to worship. His ability to recognize the naturalness of this phenomenon and simultaneously to go beyond it, to explore spiritual revelation, makes his work fresh and highly readable today. While drawing on a strong distinction between theology and philosophy, Aquinas interleaved them intricately in his writings, which range from an examination of the structures of thought to the concept of God as the end of all things. This accessible new translation chooses substantial passages not only from the indispensable Summa Theologicae, but from many other works, fully illustrating the breadth and progression of Aquinas's philosophy. ABOUT THE SERIES: For over 100 years Oxford World's Classics has made available the widest range of literature from around the globe. Each affordable volume reflects Oxford's commitment to scholarship, providing the most accurate text plus a wealth of other valuable features, including expert introductions by leading authorities, helpful notes to clarify the text, up-to-date bibliographies for further study, and much more.