Thomas Aquinas DictionaryRanking among the most comprehensive systematicians of theological thought, Thomas Aquinas, the bulwark of Scholasticism, looked into virtually every corner of the theological edifice. "There are two sorts of . . ." This and phrases similar to it are constant expressions repeated on almost every page of St. Thomas' masterwork, Summa Theologiae. They are vivid reflections of his investigative method, a method that consisted of a broad and liberal