He who does something by himself without asking, or who contradicts and says, ‘I am not doing it,’ or who murmurs, if it is a serious matter, let him do penance with three impositions, if a slight one, with one. An affirmation frankly made against another is to be rewarded with fifty strokes, but if it is made of design, with an imposition of silence; for if it is made through contentiousness, the penance should be for a week.