The papacy as a permanent office is rooted in Christ's appointment of Peter and the early Church's recognition that Peter's authority passed to his successors in the See of Rome.
The early Bishop of Rome was nothing like the medieval or modern Pope. Papal authority as we know it was a gradual political acquisition, not a divine institution.
The ecumenical councils, not the pope, are the supreme authority in the Church. The pope is subject to councils, as the Council of Constance demonstrated.
Peter has spoken through Leo.
The papacy is not merely Peter's personal authority but an office that outlives its first holder. The key evidence is the nature of the keys. In Isaiah 22:22, Eliakim receives the key of the house of David. This is an office, not a personal charism: when Eliakim dies, someone else receives the key. Jesus applies this same imagery to Peter. If the keys are an office, they pass to successors.
The early Church acted accordingly. Clement of Rome (c. AD 96) wrote to the Corinthian church to resolve a dispute, exercising authority over a distant community while the apostle John was still alive in Ephesus. If Roman primacy were merely personal to Peter, Clement's intervention would be inexplicable.
Irenaeus (c. AD 185) lists the succession of Roman bishops from Peter to his own day and argues that agreement with Rome is the test of orthodoxy. He does not treat this as one tradition among many but as the norm by which all churches are measured.
The councils themselves demonstrate papal authority in action. Chalcedon (451) received Leo's Tome with the declaration 'Peter has spoken through Leo.' Constantinople III (681) condemned Pope Honorius for failing to exercise his authority, which paradoxically confirms that the authority existed to be failed.
The historical development of papal authority is not evidence against the papacy any more than the historical development of Christological language is evidence against the divinity of Christ. Institutions develop; that does not mean they were invented.
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