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Because Church Latin has never been in colloquial use, its standards are set in stone (or ink, if you will). It has never changed (except by the addition of new theological or canonical terms) since the Church adopted it. Many of the more gifted fathers and doctors have made use of the poetic beauty of classical Latin, but when one comes to the Latin of the Middle ages (and, pre-eminently, the Latin of Saint Thomas Aquinas), the beauty is far more prosaic; it has that angelic simplicity that comes with the clarity of ordered thought. Not that the "angelic doctor" never incorporates the genius of classical expression, for he does, but generally speaking, especially in the Summa Theologica, he avoids that.
The Summa was originally written somewhat in the line of lecture notes from which to teach his students at the university of Paris. In fact, his closest disciples edited the entire work under the saint's direction, while finishing the uncompleted last section on the sacraments after his death. In order to understand the thought of Saint Thomas one must have a teacher who understands the thought of a Latin doctor of the thirteenth century. No one, even if he has more than a basic knowledge of Latin, can just pick up the Summa Theologica and presume that by reading the original language he will fully appreciate the mind of this doctor. No, one needs a teacher who has a command of the language's philosophical and theological syntax and who can, not just translate the Latin text literally, but transmit the meaning of a phrase in its particular context. Even if one is a seminary student fortunate enough to have a good Latinist to help him through the Summa, one will not have that teacher at hand for more than a few semesters. To fully appreciate the thought of Saint Thomas, and utilize his wisdom throughout one's life, one needs a ready guide that will help him understand the original text without having always to depend on someone else's translation. That ready guide is Dr. Roy Deferrari's twelve hundred page Lexicon of Saint Thomas Aquinas. Published in 1948, it is based on the greatest of the doctor communis' works, the Summa Theologica, together with selected passages from other writings of the saint. There is a tremendous advantage in utilizing a lexicon for specific definitive information rather than a dictionary.
Lexicon is actually a Greek word meaning the same in its original use as our word dictionary, only it did not provide definitions for every word in the language. The term lexicon was used to describe a book that listed the meanings of words, or terms, dealing with a particular subject. For example, there are Greek and Hebrew lexicons for the bible. There are lexicons for theology, philosophy, medicine, etc. This kind of research book further distinguishes itself from a dictionary by providing examples of a word's use in syntax, thereby demonstrating the variant uses that a word can take on in different kinds of sentences. Dr. Deferrari and his team (especially the Dominican scholars, Sister M. Inviolata and Ignatius McGuiness) took on an enormous task in compiling this monumental work for English speaking students. Every word of the Summa Theologica, as well as terms from other of the angelic doctor's works, is analyzed. As the author says in his Foreward:"Each word as it appears will be followed by the different English meanings with which it is used, followed in turn by some illustrations of its use in each meaning taken from the works of Saint Thomas."
"This is an "epoch-making work," wrote an exuberant Father Ignatius Smith, O.P., who penned the Preface to this lexicon. And, again, in an even more generous burst of enthusiasm, he added this commendation:
"In view of the emphasis placed by the Code of Canon Law  on the study by seminarians of St. Thomas' philosophy and theology in their Latin texts, this monumental work has brilliant significance."$178.00