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Thomas Aquinas and the Summa Theologiae
1225–1274; Dominican from 1244; Summa 1265–1274 (unfinished)· Person· People
Historical recordConfirmed by archaeology, outside sources or contemporary records.
Italian Dominican friar whose Summa Theologiae joined Aristotle's philosophy with Christian faith; the Catholic Church's most influential theologian.
See it on the Bible & Christianity map →What it is
Born near Aquino around 1225 to a noble family, Thomas joined the new Dominican order in 1244; his brothers held him captive for about a year to stop him. He studied under Albert the Great and taught at Paris. His Summa Theologiae (1265–1274) works through over 500 questions, each answered after weighing objections, and offers 'five ways' to argue for God's existence. In December 1273, after an experience at Mass, he stopped writing, saying it all seemed 'like straw'.
Why it matters
He presented faith and reason as allies. In 1879 Pope Leo XIII made his thought the model for Catholic teaching; his natural-law ethics still shape Catholic positions.
Life, legacy and sources
His works survive in many manuscripts, some in his own nearly illegible hand. He was canonized in 1323 and named a Doctor of the Church in 1567.
Questions and debates
What happened in December 1273 is unknown: a mystical vision, a stroke or exhaustion. He died three months later, aged about 49.
Connections (2)
▸Thomas Aquinas and the Summa Theologiae systematized, in his Summa, teaching on The sacraments (baptism, Eucharist and the seven)Historical record
The connection
In the third part of his Summa, Thomas explained the seven sacraments with Aristotle's ideas: each has 'matter' (water, bread) and 'form' (the words). He gave the classic account of transubstantiation: the bread's substance becomes Christ's body while its outward appearances remain. He also wrote hymns for the feast of Corpus Christi.
When and where
Paris and Naples, 1272–1273; the section broke off unfinished at penance, and his students completed it as the Supplement.
Historical evidence
The Summa survives; the Council of Florence's 1439 decree on the sacraments follows his wording, and Trent relied heavily on him.
Questions and debates
Whether Aristotle's categories are needed to explain the Eucharist is debated; Orthodox Christians affirm the change but decline to define how it happens.
▸Thomas Aquinas and the Summa Theologiae shaped the theology of Council of Trent and the Catholic ReformationHistorical record
The connection
Aquinas's Summa Theologiae (1265–1274) supplied much of the framework and vocabulary Trent used, notably his account of transubstantiation and his reasoning on grace, merit and the sacraments. Many theologians at Trent, especially Dominicans, were trained on Aquinas, and in 1567 Pope Pius V declared him a Doctor of the Church.
When and where
Trent, 1545–1563, nearly three centuries after Aquinas died; his Dominican order and Jesuit theologians carried his thought into the debates.
Historical evidence
Trent's decrees on justification and the Eucharist closely follow Aquinas's distinctions and terms, and delegates' working papers cite him often.
Questions and debates
The story that the Summa lay on the altar beside the Bible at Trent, repeated by Pope Leo XIII in 1879, is doubted by historians.