33 In making our own these words of Our most pious Predecessor, written for the consolation of Anselm, We would not hide Our very keen sense of the danger which confronts the very best among the pastors of the Church of passing the just limit either of indulgence or resistance. How they have realized this danger is easily to be seen in the anxieties, trepidations, and tears of most holy men who have had borne in upon them the terrible responsibility of the government of souls and the greatness of the danger to which they are exposed, but it is to be seen most strikingly in the life of Anselm. When he was torn from the solitude of the studious life of the cloister, to be raised to a lofty dignity in most difficult times, he found himself a prey to the most tormenting solicitude and anxiety, and chief of all the fear that he might not do enough for the salvation of his own soul and the souls of his people, for the honor of God and of His Church. But amid all these anxieties and in the grief he felt at seeing himself abandoned culpably by many, even including his brethren in the episcopate, his one great comfort was his trust in God and in the Apostolic See. Threatened with shipwreck, and while the storm raged round him, he took refuge in the bosom of the Church, his Mother, invoking from the Roman Pontiff pitiful and prompt aid and comfort ( Epistol. lib . iii. ep. 37); God, perhaps, permitted that this great man, full of wisdom and sanctity as he was, should suffer such heavy tribulation, in order that he might be a comfort and an example to us in the greatest difficulties and trials of the pastoral ministry, and that the sentence of Paul might be realized in each one of us: "Gladly will I glory in my infirmities that the power of Christ may dwell in me. For which cause I please myself in my infirmities . . . for when I am weak then am I powerful" (2 Cor . xii. 9, 10). Such indeed are the sentiments which Anselm expressed to Urban II.: "Holy Father, I am grieved that I am not what I was, grieved to be a bishop, because by reason of my sins I do not perform the office of a bishop. While I was in a lowly position, I seemed to be doing something; set in a lofty place, burdened by an immense weight, I gain no fruit for myself, and am of no use to anybody. I give way beneath the burden because I am incredibly poor in the strength, virtue, zeal, and knowledge necessary for so great an office. I would fain flee from the insupportable anxiety and leave the burden behind me, but, on the other hand, I fear to offend God. The fear of God obliged me to accept it, the same fear of God constrains me to retain the same burden. Now, since God's will is hidden from me, and I know not what to do, I wander about in sighs, and know not how to put an end to it all" ( Epist. Lib . iii. ep. 37).
Source: Communium Rerum (Vatican.va)