St Augustine of Hippo was the earliest thinker to develop a distinctively Christian political and social philosophy. He does so mainly from the perspective of Platonism and Stoicism; but by introducing the biblical and Pauline conceptions of sin, grace and predestination he radically transforms the 'classical' understanding of the political. Humanity is not perfectible through participation in the life of a moral community; indeed, there are no moral communities on earth. Humankind is fallen; we are slaves of self-love and the destructive impulses generated by it. The State...