Thomas Aquinas

Thomas Aquinas, a Dominican friar known as the *Doctor Angelicus*, was the foremost theologian and philosopher of the Middle Ages, who achieved the great synthesis of Christian faith with the newly recovered philosophy of Aristotle. His thought became, for centuries, the framework of Catholic theology.

The dumb ox of Sicily Born about 1225 to a noble family at Roccasecca near Aquino, Thomas was sent as a boy to the abbey of Monte Cassino and then to the University of Naples, where he encountered both Aristotle and the new Dominican order of preachers. When he resolved to become a friar — an order of poverty, not the prestige his family expected — his relatives seized and confined him for about a year to change his mind; he did not. He studied at Paris and Cologne under Albert the Great, who said of his silent, heavyset pupil that this "dumb ox" would one day fill the world with his bellowing.

The Summa Theologica His masterpiece, the [Summa Theologica](/christianity/library/books/summa-theologica), is a vast, ordered exposition of the whole of theology built as thousands of disputed questions, each stating objections, a contrary authority, a reasoned answer, and replies. In it he offered the "Five Ways" — arguments for the existence of God from motion, causation, contingency, degrees of perfection, and the order of nature — and treated creation, the human person, law, grace, the virtues, Christ, and the sacraments with unmatched rigour. His [Catena Aurea](/christianity/commentary) wove a continuous commentary on the four Gospels entirely from the Church Fathers, and he wrote commentaries on Scripture and Aristotle alike, along with the great missionary handbook *Summa contra Gentiles*.

Faith and reason At a time when many churchmen feared Aristotle as a pagan threat, Thomas argued that faith and reason cannot finally conflict, since both come from the one God: unaided reason can know that God exists and something of his nature, while revelation is needed for truths that exceed reason, such as the Trinity and the Incarnation. Grace, he taught in a famous phrase, "does not destroy nature but perfects it." He gave classic form to the doctrine of the Eucharist as *transubstantiation*, and composed Eucharistic hymns still sung today. His confidence in reason and the natural order also shaped Catholic teaching on natural law.

The silent end On 6 December 1273, after a profound experience while celebrating Mass, Thomas abruptly stopped writing and left the *Summa* unfinished: "all that I have written seems to me like straw compared with what has been revealed to me." He died a few months later, in March 1274, on the way to the Second Council of Lyon, not yet fifty.

Legacy Canonised in 1323 and later named a Doctor of the Church, Thomas was declared by Pope Leo XIII in 1879 the model of Catholic philosophy, and Thomism remains a living school of thought. The Protestant Reformers and the Orthodox tradition engage him as a towering intellect while dissenting on points such as transubstantiation, the balance of grace and merit, and the weight given to Aristotelian metaphysics — differences of tradition presented here, not adjudicated. Few thinkers have so shaped how the West reasons about God, nature, and the moral life.