That marvellous Roman document of 2001, Liturgiam authenticam, took up a hope expressed by the great student of liturgical Latin Christine Mohrmann: that modern European vernaculars might develop sacral, liturgical dialects. LA talked about "the gradual creation in every vulgar tongue of a sacred style, to be recognised as the correct way of talking liturgically (sermo proprie liturgicus; para 27)" and the production of a "sacred vernacular language the vocabulary, syntax, and grammar of which are to be proper to divine worship" (para47). The current Novus Ordo Missal goes some way to fufilling that hope.
Patrimonial readers, of course, will reflect that the liturgical tradition initiated by Dr Cranmer's Prayer Books had provide just such a vernacular sacred dialect. Last Advent, the Ordinariate Missal came on stream, so that Cranmer's hieratic English - although not his heterodox theology - is now a liturgical usage in good standing within the liturgical community of the Roman Catholic Church. I wonder what Professor Mohrmann would have thought of it ... I like to imagine her warmly approving.
Cranmer had a characteristic habit of expanding, padding out, his Latin originals. The original Roman prayers were so spare, terse, and elegant that - to put it bluntly - a literal English version might be over before the congregation had started attending to what it said. This can be illustrated by the collect for the Second Sunday in Lent in the Extraordinary Form of the Roman Rite ... and in Ordinariate Use next Sunday. Bold indicates Cranmer's supplementing of the Latin Original.
Almighty God, who seest that we have no power of ourselves to help ourseves: keep us both outwardly in our bodies, and inwardly in our souls; that we may be defended from all adversities which may happen to the body, and from all evil thoughts which may assault and hurt the soul (Latin: in mente).
This superb old collect, from the Sacramentary sent by Pope Hadrian I to Charlemagne, does not feature among the Lenten Sunday collects in the modern Roman Rite ... which eliminates all five of the Sunday collects before Palm Sunday and replaces three of them with new compositions (two of these 'worked up' from some phrases found in the Mozarabic Rite). The Anglican Common Worship also eliminates them.
The old collects were just too simple, profound, austere; too imbued with that Romanita which formed Western European culture for nearly two millennia ... for modern liturgical committee-men, both Anglican and Roman, to be able to tolerate them.