Those who recite the office in choir are bound by the rubrics concerning kneeling, sitting, standing, etc. Secondly, they are bound to observe the rules of the liturgy, especially the rule as to the stop in each verse at the asterisk mark. Thirdly, they are bound to recite clearly and distinctly; but even if they cannot hear distinctly the alternate choir, or even if they recite in a low voice, they fulfil the obligation of recitation; and canons are bound at Cathedral offices to sing and chant or to lose their manual distributions and the fruits of their prebends. If a person reciting his office with a companion or in a choir does not understand the words recited by his companion or by the choir, he is not bound at the end to repeat the part which he did not understand, because such a person has the intention of offering prayer and praise to God, and that intention suffices. Moreover, the Church's precept of reciting the office should he interpreted benignly, otherwise it must give rise to many scruples; for, companions in recitation, then, always, should be anxious as to the duty of repetition or the non-fulfilled duty of complete recitation. Pronunciation of the words of the office should be _integral_. That is, the words and syllables are to be repeated fully without mutilation or abbreviation. Hence, if mutilation of the words occur to such an extent that the sense or meaning of the words is notably changed, mortal sin may be committed. But if the mutilation be small in quantity there is only a venial sin committed, and often no sin at all may be committed, as the mutilation of words or syllables may be quite involuntary, or may be done inadvertently, or may arise from an inveterate habit very difficult to correct, and in the attempt to cure it time and patience may have been spent (St. Alph., 164-165). This bad habit, if it extend over a large portion of the recitation and destroy notably the sense of the words, may bind _sub gravi_ to repetition, as this fault or habit affects the very substance of recitation. Priests seldom are bound to such a repetition, as the mutilation is not destructive to the sense of a notable part of the office and hence does not affect the substance of the obligation to vocal recital. St. Alphonsus holds (n. 165), that the obligation is fulfilled as long as the meaning is not destroyed, _quando servatur aliqua significatio verborum_. Pronunciation should be _continuous_. That is, the recitation of each hour should be continuous, non-interrupted, and every notable stoppage or break in the recitation of a canonical hour is a venial sin, if there be no excusing cause for such an interruption. Any reasonable cause for interruption (e.g., to obey a bell call, to see a parishioner who calls, to hear a confession) excuses from all fault (St. Alph., n. 168).