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.
Pope Boniface VIII
Therefore to thee it was given Many to save with thyself; And, at the end of thy day, O faithful shepherd! to come, Bringing thy sheep in thy hand.
Matthew Arnold