“I am greatly astonished at your separation from the rest of the Church and I cannot equably endure it. For Augustine, mindful that the Lord established the foundation of the Church on the Apostolic sees, says that whosoever removes himself from the authority and communion of the prelates of those sees is in schism. He states plainly that there is no church apart from one which is firmly established on the pontifical bases of the Apostolic sees. Thus how can you believe that you are not separated from the communion of the whole world if you do not commemorate my name during the sacred mysteries, according to custom? For you see that the strength of the Apostolic See resides in me, despite my unworthiness, through episcopal succession at the present time"  Pope Pelagius II   (Labbe, Conciliorum Collectione, vol. 5, col. 794f and 810)