34 Thus does God bring home even to saintly men their natural weakness, in order the better to make manifest in them the power of strength from above, and, by a humble and real sense of their individual insufficiency, to preserve with greater force their obedience to the authority of the Church. We see it in the case of Anselm and of other contemporaries of his who fought for the liberty and doctrine of the Church under the guidance of the Apostolic See. The fruit of their obedience was victory in the strife, and their example confirmed the Divine sentence that "the obedient man will sing victory" ( Prov . xxi. 28). The hope of the same reward shines out for all those who obey Christ in His Vicar in all that concerns the guidance of souls, or the government of the Church, or that is in any way connected with these objects: since "upon the authority of the Holy See depend the directions and the counsels of the sons of the Church" ( Epist. Lib . iv. ep. 1).
Source: Communium Rerum (Vatican.va)