Augustine knows by faith that God is a trinity, Father, Son and Holy Spirit, and he is seeking as far as possible to understand what he believes. In the first seven books Augustine begins by searching the scriptures of the Old and New Testaments for clues to understanding, and then argues in the language of philosophy and logic to defend the orthodox statement of the doctrine against the Arians. In the last eight books Augustine seeks to understand the mystery of the divine Trinity by observing an analogous trinity in the image of God, which is the human mind; and in so doing he also...

Along with his Confessions, The City of God is undoubtedly St. Augustine's most influential work. In the context of what begins as a lengthy critique of classic Roman religion and a defence of Christianity, Augustine touches upon numerous topics, including the role of grace, the original state of humanity, the possibility of waging a just war, the ideal form of government, and the nature of heaven and hell. But his major concern is the difference between the City of God and the City of Man - one built on love of God, the other on love of self. One cannot but be moved and impressed by the...