120 Let all be of one mind, since—as all know well—in unity there is greater strength. When it is a matter of the cause of the Catholic Church they must be ready to sacrifice personal whims, for nothing is of more value and importance. This should be their attitude, not only in doctrinal matters but also in matters of ecclesiastical and Christian discipline, to which all must submit.
Source: Ad Petri Cathedram (Vatican.va)