The real sheep follow the Good Shepherd and they will accept no vicar and no substitutes. Jesus said, “I am the way.” He also said, “My sheep hear my voice and they follow me.”
Christ made Peter a Shepherd. He told Peter to feed his sheep,and to confirm the brothers.
St. Ephraem the Syrian (ca. A.D. 350):
“Then Peter deservedly received the Vicariate of Christ over His people.”
(Ephraem, Sermon de Martyrio. SS. App. Petri et Pauli)
“To whom, O Lord, didst Thou entrust that most precious pledge of the heavenly keys? To Bar Jonas, the Prince of the Apostles, with whom, I implore Thee, may I share Thy bridal chamber…Our Lord chose Simon Peter and appointed him chief of the Apostles, foundation of the holy Church and guardian of His establishment. He appointed him head of the Apostles and commanded him to feed His flock and teach it laws for preserving the purity of its beliefs.”
(Ephraem, Homilies, 4:1, 350 A.D.)
Opatatus (c. 367 A.D.):
“In the city of Rome the Episcopal chair was given first to Peter, the chair in which Peter sat, the same who was head — that is why he is also called Cephas [Rock] — of all the Apostles, the one chair in which unity is maintained by all. Neither do the Apostles proceed individually on their own, and anyone who would presume to set up another chair in opposition to that single chair would, by that very fact, be a schismatic and a sinner… Recall then the origins of your chair, those of you who wish to claim for yourselves the title of holy Church.”
(Opatatus, The Schism of the Donatists, 2:2)
St. Epiphanius of Salamis (385 A.D.):
"Holy men are therefore called the temple of God, because the Holy Spirit dwells in them; as that Chief of the Apostles testifies, he that was found to be blessed by the Lord, because the Father had revealed unto him. To him then did the Father reveal His true Son; and the same [Peter] furthermore reveals the Holy Spirit. This was befitting in the First of the Apostles, that firm Rock upon which the Church of God is built, and the gates of hell shall not prevail against it. The gates of hell are heretics and heresiarchs. For in every way was the faith confirmed in him who received the keys of heaven; who looses on earth and binds in heaven. For in him are found all subtle questions of faith. He was aided by the Father so as to be (or lay) the Foundation of the security (firmness) of the faith. He (Peter) heard from the same God, ‘feed my lambs’; to him He entrusted the flock; he leads the way admirably in the power of his own Master.
(Epiphanius, T. ii. in Anchor)
St. John Chrysostom, Patriarch of Constantinople (c. A.D. 387):
“Peter, that Leader of the choir, that Mouth of the rest of the Apostles, that Head of the brotherhood, that one set over the entire universe, that Foundation of the Church.”
(Chrys. In illud hoc Scitote)
John Cassian, Monk (c. AD 430), to Pope Celestine I:
“That great man, the disciple of disciples, that master among masters, who wielding the government of the Roman Church possessed the principle authority in faith and in priesthood. Tell us, therefore, we beg of you, Peter, prince of Apostles, tell us how the Churches must believe in God.”
(Cassian, Contra Nestorium, III, 12, CSEL, vol. 17, p. 276).
St. Fulgentius of Ruspe (A.D. 465-533):
“That which the Roman Church, which has the loftiest place on the earth, teaches and holds, so does the whole Christian world believe without hesitation for their justification, and does not delay to confess for their salvation.”
(Letter 17, 21, A.D. 519)
John VI, Patriarch of Constantinople (c. A.D. 715):
“The Pope of Rome, the head of the Christian priesthood, whom in Peter, the Lord commanded to confirm his brethren.”
(John VI, Epist. ad Constantin. Pap. ad. Combefis, Auctuar. Bibl. P.P. Graec.tom. ii. p. 211, seq.)