If, then, the Greeks or others say that they were not committed to the care of Peter and his successors, they necessarily confess that they are not of the sheep of Christ; for the Lord says, in John, that there is one fold, one shepherd, and one only.
Sive ergo Graeci sive alii se dicant Petro ejusque successoribus non esse commissos: fateantur necesse est, se de ovibus Christi non esse, dicente Domino in Joanne, unum ovile et unicum esse pastorem.
Original text (Latin)