This paper explores the claim made by Thomas Aquinas in Summa Theologiae, I, q. 1, a. 3 that ‘sacred doctrine’ is ‘scientific.’ After reviewing some of the key historical commentators on the question, I propose an examination of Thomas' treatment of the gift of prophecy as providing an important clue into discerning more clearly his evolution from an Aristotelian understanding of knowledge or ‘science’ (scientia) to a fuller sense of the term scientia as used by Thomas. Chief among these is a clue into how Thomas resolves the difficulty between necessity and history. His treatment of prophecy in the Summa Theologiae gives one a glimpse into how Thomas is a historical thinker, despite weighty authorities such as Etienne Gilson arguing otherwise. Closer attention to prophecy permits one to rethink Thomas' account of sacred doctrine in Question One and appreciate how pivotal the fact of divine revelation having been made to prophets in history is for its ‘scientific’ character.
