Summa Theologica Part I-II (Pars Prima Secundae) Thomas Aquinas - The Summa Theologiae (Latin: Compendium of Theology or Theological Compendium; also subsequently called the Summa Theologica or simply the Summa, written 1265-1274) is the best-known work of Thomas Aquinas (c.1225-1274), and although unfinished, "one of the classics of the history of philosophy and one of the most influential works of Western literature." It is intended as a manual for beginners in theology and a compendium of all of the main theological teachings of the Church. It presents the reasoning for almost all points of Christian theology in the West. The Summa's topics follow a cycle: the existence of God; Creation, Man; Man's purpose; Christ; the Sacraments; and back to God. (courtesy of wikipedia.com). This is part 1-2, 'Pars Prima Secundae'. In a chain of acts of will, man strives for the highest end. They are free acts, insofar as man has in himself the knowledge of their end (and therein the principle of action). In that the will wills the end, it wills also the appropriate means, chooses freely and completes the consensus. Whether the act be good or evil depends on the end. The "human reason" pronounces judgment concerning the character of the end; it is, therefore, the law for action. Human acts, however, are meritorious insofar as they promote the purpose of God and his honor. By repeating a good action, man acquires a moral habit or a quality which enables him to do the good gladly and easily. This is true, however, only of the intellectual and moral virtues (which Aquinas treats after the manner of Aristotle); the theological virtues are imparted by God to man as a "disposition", from which the acts here proceed; while they strengthen, they do not form it. The "disposition" of evil is the opposite alternative. An act becomes evil through deviation from the reason, and from divine moral law.

Thomas Aquinas (sometimes styled Thomas of Aquin or Aquino), was a Dominican friar and priest notable as a scholastic theologian and philosopher. He is honored as a saint and "Doctor of the Church" in the Roman Catholic tradition. Aquinas lived at a critical juncture of western culture when the arrival of the Aristotelian corpus in Latin translation reopened the question of the relation between faith and reason, calling into question the modus vivendi that had obtained for centuries. This crisis flared up just as universities were being founded. Thomas, after early studies at Montecassino, moved on to the University of Naples, where he met members of the new Dominican Order. It was at Naples too that Thomas had his first extended contact with the new learning. When he joined the Dominican Order he went north to study with Albertus Magnus, author of a paraphrase of the Aristotelian corpus. Thomas completed his studies at the University of Paris, which had been formed out of the monastic schools on the Left Bank and the cathedral school at Notre Dame. In two stints as a regent master Thomas defended the mendicant orders and, of greater historical importance, countered both the Averroistic interpretations of Aristotle and the Franciscan tendency to reject Greek philosophy. The result was a new modus vivendi between faith and philosophy which survived until the rise of the new physics. The Catholic Church has over the centuries regularly and consistently reaffirmed the central importance of Thomas's work for understanding its teachings concerning the Christian revelation, and his close textual commentaries on Aristotle represent a cultural resource which is now receiving increased recognition.