Edward J. Quigley, The Divine Office: A Study of the Roman Breviary
“ Every holder is bound, under pain of mortal sin, to recite the Divine Office daily, if the benefice be an ecclesiastical benefice fulfilling the conditions named above. The omission of the recital of the Divine Office by a beneficed person is a grave sin against the virtue of religion and a grave sin against the virtue of justice. For the Church imposes on the beneficiary the duty of the Office recital, on condition that he may not take the fruits of his benefice if he do not recite the Office. ”
