Under the Denunciatio, the accuser denounced another without offering to prove his case. This method, too, had been found unsatisfactory in general for heresy trials, and with the development of the monastic Inquisition, had gradually yielded to the Inquisitio, which experience had found most effective. The Inquisitor, unlike the judge under Roman Law, was seeking not to punish the offense, primarily, but to heal and reconcile the offender. As a priest, he was not interested in the prosecution of crime – that was the state’s business. What he desired was the spiritual health of the offender, and this involved his reconciliation with the Church of God, and soem sort of penance to test his sincerity and help him gain the strength to persevere in his reformation. For this reason the earlier Inquisition was not very hospitable to lawyers and advocates as counsel for the accused.
There has been a great deal of misunderstanding about this; it has been made the ground of a strong indictment of the Inquisition, as unwilling to give the accused the fair chance that he is allowed in modern criminal practice. But the Inquisitor did not have this juridical point of view. He was a specialist in the science of the things of God, the doctor of souls, as Bernard Gui said, whose aim was not to punish but to heal and save. If the heretic fell into the hands of the state, he was burned without getting a second chance. The Inquisition saved him from this fate, if he would adjure and be reconciled, and there is no doubt that large numbers of heretics escaped the faggots and the stake because patient Inquisitors induced them to abjure, or frightened them into it. For all this the best method seemed to be the Inquisitio.
William Thomas Walsh, Characters of the Inquisition (1940)