3 What a good is this charity, Brethren! What more precious? What yields greater light? Or strength? Or profit? Or security? Many are the gifts of God, which even the wicked have, who shall say, “Lord, we have prophesied in Your Name, in Your Name have cast out devils, in Your Name done many mighty works.” And He will not answer, “You have not done them.” For in the Presence of so great a Judge, they will not dare to lie or boast of things they have not done. But for that they had not charity, He answers them all, “I know you not.” Now how can he have so much as the smallest charity, who when even convicted, loves not unity? It was then as impressing on good shepherds this unity, that our Lord was unwilling to mention many shepherds. For it is not, as I have said already, that Peter was not a good shepherd, and Paul, the rest of the Apostles, and the holy Bishops who were after them, and blessed Cyprian. All these were good shepherds; and notwithstanding to good shepherds, He commended not good shepherds, but a good Shepherd. “I,” says He, “am the good Shepherd.”
Source: Sermons on Selected Lessons of the New Testament (New Advent)