Abstract

The article is an attempt to answer the question of why Aquinas stops his commentary on Boethius’s De Trinitate at question six, article four, whereas this is before the point in the treatise where Boethius gets to the heart of the subject matter. The author shows that Aquinas (1) decides to do so because the treatise cannot afford him the means of demonstrating the existence of the Trinity, (2) holds that, although rational explanations could be given in terms of proof of God’s existence, one cannot come to the knowledge of the truth of the existence of the Trinity by reason alone, and (3) concludes that, although we cannot prove the doctrine of the existence of the Trinity through philosophical demonstration, we can, however, show that this doctrine and other doctrines known through the light of faith are not contradictory.