Never mind that some in the pews couldn't hear or understand them. To purists, the sonorous words of the Latin Mass were mystical, ancient, and layered with meaning, never to change.
Change they did, of course.
In 1970, the Catholic Church replaced Latin with liturgies spoken in the languages of the people.
That old theological weight is just what church leaders hope their flocks will rediscover next month, when they encounter revisions to many of the English-language prayers and responses they have spoken for 41 years.
Ordered by the Vatican a decade ago, and years in translation, the revised text of the Missal to be presented Nov. 27 represents an "absolutely faithful" version of the Latin, according to the Rev. Dennis Gill, director of the Archdiocese of Philadelphia's Office for Worship.
Despite months of preparation at parishes, the changes are sure to jar some layfolk, Gill concedes, and may "take some adjustment."
But the seemingly new prayers and responses are far more traditional than those they replace, he said, and offer a "more complete presentation of the ideas" at the heart of the Catholic faith.
The revision, Gill said, is a "critical and ongoing part of the work" of the Second Vatican Council of 1962-65.
Eager to make the Mass a more vibrant experience for the laity - who for centuries had worshipped passively, in near-silence - the council called for user-friendly liturgies spoken aloud by worshippers in their own languages.
Almost overnight, the Credo in unum deums and the Hoc est enims uttered in cavernous cathedrals and mud-hut chapels for 1,000 years were reduced to relics. Accessibility - a laudable idea - became the watchword.
To those who knew the Latin, however, the English translation lacked not just mystery; it lacked spiritual depth.
"Our current translation might seem more personal and friendly," Cardinal Francis George, archbishop of Chicago, recently observed, "but that's the problem."
After 1970, for example, a eucharistic prayer that in Latin depicted God gathering the faithful in an assembly so vast it was spanned by "the rising of the sun to its setting" became "a people . . . from east to west."