教皇不可謬説
Although St. Cecilia's was still only a priory, Cécile Bruyère was named abbess of the new foundation at the age of 24 by Pope Pius IX on 20 June 1870. This may have been a gesture of thanks towards Dom Guéranger for his great support to the Pope at the First Vatican Council in favour of the recently proclaimed dogma of Papal infallibility.