A far more important result of the supreme position accorded to the Papacy was the gradual emergence of the doctrine of papal infallibility. "The Church of Rome," says Gregory VII, "through St. Peter, as it were by some privilege, is from the very beginnings of the faith reckoned by the Holy Fathers the Mother of all the Churches and will so be considered to the very end; for in her no heretic is discerned to have had the rule, and we believe that none such will ever be set over her according to the Lord's special promise. For the Lord Jesus says, 'I have prayed for thee that thy faith fail not.'" And in accordance with this principle the _Dictatus Papae_ lays it down that "the Roman Church has never erred, nor, as Scripture testifies, will it ever err." Innocent III pertinently asks how he could confirm others in the faith, which is recognised as a special duty of his office, unless he himself were firm in the faith. But many writers, including Innocent himself, believed that it was possible for a Pope to err in some individual point, and that it was the duty of the Church to convert him. Thomas Aquinas, while holding it certain that the judgment of the Church Universal cannot err in these matters which belong to the faith, gives to the Pope alone, as the authority by whom synods are summoned, the final determination of those things which are of faith. Yet even he allows that in matters of fact, such as questions of ownership and criminal charges, false witnesses may lead the judgment of the Church astray. [Sidenote: Kings and papal claims.]