The Great CatechismThe Great Catechetical Oration (or Address on Religious Instruction) is perhaps the most successful work of St. Gregory of Nyssa (335 395 A. D.). In it, he gives a systematic overview of theology in miniature, laying out the Christian view of how human nature, lost from the fall of Adam, has been restored to the image of God. The work is divided into three parts 1) The Trinity, 2) The Reasonableness of the Incarnation, 3) The Sacraments. The text for