St. Thomas Aquinas (AD 1225-1274) St. Thomas Aquinas was a Dominican friar, philosopher, theologian, and next to St. Augustine, he is considered the Church’s greatest thinker. He classically articulated the harmony of faith and reason and demonstrated in his work an ability to engage new ideas while remaining faithful to tradition. The writings of St. Thomas, especially his Summa Theologiae and Summa Contra Gentiles, have a privileged position in the Catholic intellectual tradition and the philosophy curriculum at Borromeo Seminary.