William Henry Windsor Fanning, Catholic Encyclopedia (1913)
“ It is true that the Roman Pontiff has no superior on earth into whose hands he can resign his dignity, yet he himself by the papal power can dissolve the spiritual marriage between himself and the Roman Church. A papal Abdication made without cause may be illicit, but it is unquestionably valid, since there is no one who can prohibit it ecclesiastically and it contravenes no divine law. ”
