A nice letter from Augustine to an eager, young pastor, Deogratias, who is looking to better receive and instruct seekers/converts, as well as how to handle discouragement in preaching.
He develops a twofold process in his instruction: historical exposition and moral exhortation. This first section is, basically, an explanation of salvation history, from Genesis to Revelation. Really helpful overview of the storyline of Scripture. Shows Augustine's own theological interpretation of the OT. The moral exhortation is an invitation to rely on and hope in God. Really great section.
Of most interest to me was Augustine's advice on how to handle discouragement in preaching. Searching, honest, and patient, Augustine shows himself to be a wise pastor and a keen listener, counseling patience and steady faithfulness. A lot of helpful wisdom here that could probably be boiled down to: remember God's love, rejoice in correcting your mistakes, have sympathy for our listeners, work hard to communicate well and effectively, take comfort in the growth of Christians under our care, and remember the divine purposes for ministry.
Augustine is always worth the read. This book is no different.