by Augustine of Hippo
In contrast to the unwieldy and meandering City of God, Augustine’s four books On Christian Doctrine are notably focused in comparison. Augustine seems to be at his best when he can let his rhetorical skills breathe. His arguments stay rooted in his fundamental belief in biblical truth, but at lea...
While not exactly the easiest or funnest thing to read. Augustine's work is important to the history of Christian teaching. He looks at the theology behind teaching and then examines various aspects of study and eloquent speech.