Saint Thomas Aquinas
For a long time Thomas was either ignored or misunderstood by even the greatest philosophers, but his teachings ultimately triumphed. That they are official in the Roman Catholic Church does not mean that Catholics may not adhere to other philosophies, notably the Scotist teachings, developed from the doctrines of Duns Scotus. St. Thomas's synthesis is now recognized as one of the greatest works of human thought. His wide-embracing philosophy can be applied to every realm of human life.
The terms New Thomism, neo-Thomism, and neo-scholasticism are used for a school of philosophy of the 20th cent. The Catholic leaders of this school were Étienne Gilson and Jacques Maritain, who sought to apply Thomistic principles to modern economic, political, and social conditions. Non-Catholics also have adapted Thomistic principles to modern life; a leader among them is Mortimer Adler.