Book excerpt: The Routledge Guidebook to Aquinas' Summa Theologiae introduces readers to a work which represents the pinnacle of medieval Western scholarship. Outlining the main arguments Aquinas utilizes to support his conclusions on various philosophical questions, this clear and comprehensive guide explores the historical context in which Aquinas wrote and provides a critical discussion of the topics outlined in the text including theology, metaphysics, epistemology, psychology, ethics, and political theory. This guidebook is essential reading for anyone seeking an understanding of this highly influential work in the history of philosophy.