The Great Catechism
Oratio Catechetica Magna, the Trinity, the Incarnation, the Sacraments, in forty chapters
2 h 43 min · Age of the Councils · Greek and Byzantine
Gregory's catechist's notebook: how to teach the Trinity, the Incarnation, the Atonement, and the Sacraments to Jews, pagans, Manicheans, and Arians. One of the great systematic theological works of the fourth century, alongside Athanasius on the Incarnation and Basil on the Holy Spirit.