The Summa Theologica or summary of Theology' is a five-volume work synthesized according to Roman Catholic beliefs inherited from the Bible and Church Tradition. It attempts to present several thousand important theological questions as systematically as possible and it includes insights from Greek philosophers, especially Aristotle. The Summa Theologica was written by Saint Thomas Aquinas, a Dominican priest, theologian and philosopher. He was considered the most important Christian thinker of the High Middle Ages and was canonized in 1323, fifty years after his death. One of his biographers has called the Summa Theologica "a cathedral of thought-, pertaining to profound contents. He worked on Summa Theologica from 1266 to 1273 and when he was nearly finished, he underwent an experience so intense that he thought that everything he had written seemed like straw. After this, he completely stopped writing and he died three months later. .
Summa Theologica is studied in all major Catholic universities and seminaries, as well as theologians and philosophers of religion of all denominations. It was formerly written in Latin but was translated into English by the Fathers of the English Dominican Province. Summa Theologica is written in a form common to treatises of that age. All of theology is divided into its major topics and these topics are divided into subtopics, which is described by St. Thomas as questions'. The subtopics are then divided into articles', which are specific queries concerning the topic being explored in that particular question'. The five volumes of the Summa Theologica are Prima Pars, Prima Secund Partis, Secunda Secund Partis, Tertia Pars and Supplementum Tertia Partis. The topics range from God, the Holy Trinity, and the Nature of Christ to the nature and psychology of the human person and the nature and mission of the Catholic Church. .
Included in the Summa Theologica is St.