The Daily Mass and the Conventual Mass were the centre of the monastic life in community.
Of Priests Who May Wish to Live in the Monastery
If a priest asketh to be received into the monastery, let consent not be granted too readily; still, if he urgently persisteth in his request, let him know that he must keep the whole discipline of the Rule, and that nothing will be relaxed in his favor, that it may be as it is written: "Friend, whereunto art thou come" (Mt 26:25)?
It may be granted him, however, to stand next after the Abbot, and to give the blessing, or to celebrate Mass, but only if the Abbot ordereth him to do so; but if he doth not bid him, let him not presume to do anything under whatever consideration, knowing that he is under the discipline of the Rule, and let him rather give examples of humility to all. But if there is a question of an appointment in the monastery, or any other matter, let him be ranked by the time of his entry into the monastery, and not by the place granted him in consideration of the priesthood.
But if a cleric, moved by the same desire, wisheth to join the monastery, let him too have a middle place, provided he promiseth to keep the Rule and personal stability.
Of the Priests of the Monastery
If the Abbot desireth to have a priest or a deacon ordained, let him select from among his monks one who is worthy to discharge the priestly office.
But let the one who hath been ordained be on his guard against arrogance and pride, and let him not attempt to do anything but what is commanded him by the Abbot, knowing that he is now all the more subject to the discipline of the Rule; and in consequence of the priesthood let him not forget the obedience and discipline of the Rule, but advance more and more in godliness.
Let him, however, always keep the place which he had when he entered the monastery, except when he is engaged in sacred functions, unless the choice of the community and the wish of the Abbot have promoted him in acknowledgment of the merit of his life. Let him know, however, that he must observe the Rule prescribed by the Deans and the Superiors.
If he should otherwise, let him be judged, not as a priest, but as a rebel; and if after frequent warnings he doth not amend, and his guilt is clearly shown, let him be cast forth from the monastery, provided his obstinacy is such that he will neither submit nor obey the Rule.