Graham Ward on Gregory of Nyssa’s Great Catechetical Oration: “The ‘system’ [of catechesis] is not an abstract set of propositions set out by the ministers who preside and to which allegiance is given by those taught. It is, first of all, intrinsic to the word itself as the Logos; the word of faith that teaches. The system is the constraining and necessary logic of the Logos. It is co-relative to both a social and institutional practice (teaching) and an operation (being saved). It is implicated in ‘the mystery of godliness’ or the hidden working of piety. Its aim is salvation through conversion.”