Audisio was a pious and charitable priest, and spent large sums in benevolent works. He was an excellent teacher of sacred eloquence, and his manual on the subject was translated into many languages and frequently quoted approvingly. He also devoted himself to historical studies, especially in illustration of the papacy, bringing to them absolutely good intentions, assiduous industry, and much just and acute observation, such as was not then common in the circle which surrounded him. Nevertheless these historical labours had no great intrinsic value, especially at a time when so large a number of documents were being published. For this reason they are no longer sought after by students.