Reasoning steps: Papal primacy and infallibility

Verdicts: S8 · Papal primacy and infallibility. Shared notes and post-750 development: church-authority.

S08.1 (was church-authority/P1): Peter and the Roman church’s primacy

Step S08.1.1: Scripture

Matt 16:18–19: ‘on this rock’ and the keys; Luke 22:32: ‘strengthen your brothers’; John 21:15–17: ‘feed my sheep’. Peter leads among the apostles (Acts 1–5), yet James gives the judgment in Acts 15:19 and Paul opposes Peter to his face (Gal 2:11). Nothing is said about successors or Rome.

Step S08.1.2: Patristic evidence

Clement (T1): the Roman church writes with authority, ’through the Holy Spirit’, naming no bishop. Ignatius (T1): Rome ‘presides over love’. Irenaeus (T2): every church must agree with Rome ‘on account of its preeminent authority’, founded by ‘Peter and Paul’. Cyprian (T3): the other apostles were ’the same as was Peter … honour and power’, Peter being the beginning of unity. Sources: clement-of-rome-pap-s1 · ignatius-pap-s1 · irenaeus-pap-s1 · irenaeus-pap-s2 · cyprian-pap-s1.

Step S08.1.3: Weighing decision

Reading A: Rome’s bishop holds Peter’s office of universal jurisdiction from the start. Reading B: no special place for Peter or Rome. Reading C: Peter led among the apostles, and the Roman church had a primacy of honour and a leading role in guarding the apostolic tradition (T1–T2), without jurisdiction over other churches. C is chosen. A reads later structure into Clement, Ignatius and Irenaeus; B ignores them.

• Confidence: Medium.

Step S08.1.4: Source-proximity weighing

• Scripture (benchmark): Peter has a real leading role (Matt 16; Luke 22; John 21), yet he is corrected (Gal 2) and does not rule the Jerusalem council alone (Acts 15). No text speaks of successors or Rome. (Scripture confidence: medium)
• Assessment: T1 sources honour Rome but name no ruling bishop; T2 Irenaeus is the strongest text, and its ‘preeminent authority’ is about guarding tradition. Calling the pope ‘Antichrist’ (WCF XXV.6; 1689 26.4) lacks both biblical (exegetical) and patristic support.

S08.2 (was church-authority/P2): Universal jurisdiction and infallibility of the bishop of Rome

Step S08.2.1: Scripture

Gal 2:11–14: Peter publicly corrected. Acts 15: a council decides. 1 Pet 5:1: Peter a ‘fellow elder’. No text assigns infallibility or universal jurisdiction to a successor.

Step S08.2.2: Patristic evidence

Nicaea canon 6 bases Alexandria’s jurisdiction on custom, ‘since the like is customary for the Bishop of Rome also’. Chalcedon canon 28 grounds Rome’s privileges in its being ’the royal city’. Cyprian: the apostles had equal honour and power. Gregory the Great (T4), himself bishop of Rome, calls ‘universal bishop’ a ‘proud and foolish title’: Peter was a member of the universal church, under one Head. Sources: cyprian-pap-s1 · nicaea-i-pap-s1 · chalcedon-pap-s1 · gregory-the-great-pap-s1 · gregory-the-great-pap-s2.

Step S08.2.3: Weighing decision

Universal immediate jurisdiction and ex cathedra infallibility (Vatican I) are not found in T1–T4 sources here; canons treat sees’ privileges as customary and regional, and Gregory rejects the universal title. Verdict: not supported.

• Confidence: Medium–high.

Step S08.2.4: Source-proximity weighing

• Scripture (benchmark): No text gives Peter’s successors universal jurisdiction or infallibility; Peter is corrected and calls himself a fellow elder. (Scripture confidence: medium-high)
• Assessment: Vatican I (1870) lacks support at every tier and in Scripture; Irenaeus III.3.2 is the nearest text and concerns agreement with an apostolic church, not jurisdiction.