De doctrina Christiana (English: On Christian Doctrine or On Christian Teaching) is a theological text written by Augustine of Hippo. It consists of four books that describe how to interpret and teach the Scriptures. The first three of these books were published in 397 and the fourth added in 426. By writing this text, Augustine set three tasks for Christian teachers and preachers: to discover the truth in the contents of the Scriptures, to teach the truth from the Scriptures, and to defend scriptural truth when it was attacked. Historical context Starting in AD 389, the powerful application of faith to politics led Emperor Theodosius to issue a series of edicts against paganism that concluded in 391 with a law making pagan worship illegal. During the Golden Age of Athens, politics and man-made laws guided human conduct, and the city-state was viewed as a manifestation of the highest human values, giving rise to political philosophy. Christianity effected a change in the course of Western society, requiring a new cultural identity and a new educational curriculum. With this aim in mind, Emperor Justinian (AD 483–565) cut off all state funding to chairs of rhetoric, essentially bringing the pagan classical tradition to a close. The classical heritage was from this time onward viewed through the lens of Christianity, increasing the need for an approach to the teaching of scripture that matched the sophistication of the classical inheritance. De doctrina Christiana supplied the medieval world with that tool. Summary Prologue The Prologue consists of a response to those who would resist Augustine's project of providing rules for interpretation of the Scriptures. Augustine outlines three possible objections, including those who do not understand his precepts, those who fail to make effective use of his teachings, and those who believe they are already prepared to interpret the Scriptures. To the first two types of critics, Augustine states that he cannot be held responsible for their inability to understand. He then addresses the third type of critic, those who believe they are already able to interpret the Scriptures. If their claims are true, he acknowledges that they have received a great blessing. However, they must admit that language itself was learned from a human being, not directly from God. Therefore, God has created human beings to learn from one another, and we ought to learn with humility. All good teaching from human beings derives ultimately from