50 Not, indeed, that the Doctor of Aosta reached all at once the heights of theological and philosophical speculation, or the reputation of the two supreme masters Thomas and Bonaventure. The later fruits of the wisdom of these last did not ripen but with time and the collaboration of many doctors. Anselm himself, with that great modesty so characteristic of the truly wise, and with all his learning and perspicacity, never published any writings except such as were called forth by circumstances, or when compelled thereto by some authority, and in those he did publish he protests that "if there is anything that calls for correction he does not refuse the correction" ("Cur Deus homo," lib. ii. cap. 23), nay, when the question is a debated one, and not connected with the faith, he tells his disciple: "you must not so cling to what we have said as to abide by it obstinately, when others with more weighty arguments succeed in overthrowing ours and establishing opinions against them; should that happen you will not deny at least that what we have said has been of profit for exercise in controversy" ("De Grammatico," cap. 21 sub finem).
Source: Communium Rerum (Vatican.va)