Durandus explains with skill the Augustinian texts, chiefly in the De doctrinâ christianâ and the Letter to Boniface, misused by Berengarius; but in the last analysis he appeals to the argument of authority already used by Guitmond: "The saintly Doctor of Hippo, wearied by the labours of composition, fails at times to clearly bring out his thought.
Durandus skillfully analyzes Augustinian texts, especially in De doctrinâ christianâ and the Letter to Boniface, which Berengarius misused; however, he ultimately relies on the argument of authority that Guitmond had previously employed: "The saintly Doctor of Hippo, fatigued by writing, occasionally has trouble clearly expressing his thoughts.