Now we may, without hesitation, take S. Thomas as the witness of what was taught both by the Dominican Order and by the schools of the Church in the century before the Council of Constance.
8. S. Bonaventure, in like manner, will represent the Franciscan Order: 'Peter, named from the Rock, was by the Lord placed as the foundation of the Church: "Thou art Peter, &c." Rabanus says that all the faithful throughout the world may understand that whosoever separate themselves in any way from the unity of his faith or of his communion can neither be absolved from the bonds of sin, nor can enter the gate of the kingdom of heaven. Therefore the Lord gave to Peter extraordinary powers over all the Apostles in the words, "And thou, when thou art converted, confirm thy brethren."'[1] Again, he says: 'If, in the time of the figurative priest, it was sin to oppose the sentence of the Pontiff, much more in the time of the revealed truth and grace, when it is known that the plenitude of power is given to the Vicar of Christ, is it sin, no way to be tolerated in Faith or morals, to dogmatise contrary to his definition, by approving what he reproves, building up again what he destroys, and defending what he condemns.'[2]
9. The Council of Lyons in 1274 drew up a form of profession to be made per modum juramenti by the Greeks in the following words: 'The Holy Roman Church has supreme and full primacy and principality
