Peter, the Rock of the Church

Here's the common pushback: the Greek uses two different words, 'petros' for Peter and 'petra' for rock, so Jesus must have been pointing to Peter's confession of faith, not Peter himself.

But that conclusion doesn't follow, and the Church has consistently read it otherwise. The Catechism is direct: the Lord 'made Simon alone, whom he named Peter, the rock of his Church' (CCC 881). The rock is Peter. The name and the role go together.

Augustine actually holds the linguistic distinction and the Catholic reading at the same time. He acknowledges the wordplay and still concludes that Peter is built on Christ, the true Rock, and that Peter participates in that foundation precisely because of his confession. So the Church can grant the Greek observation without giving up the point. It's not Peter's faith instead of Peter. It's Peter, precisely because of his confession, entrusted with a real office. Aquinas puts it this way: Christ is the foundation 'through himself,' while Peter is the foundation 'insofar as he holds the confession of Christ, insofar as he is his vicar.' That's a both/and, not an either/or.

Then look at what follows. Jesus hands Peter the keys of the kingdom (Matthew 16:19). Keys go to a person with a role, not to an idea. Bellarmine notes that the one given the keys of a city is established as its governor. The image is about delegated authority, and it lands on a person.

None of this makes Peter superhuman. He failed badly at times. But CCC 881 and Lumen Gentium 22 both teach that this office of unity and authority continues in Peter's successors, the bishops in communion with the Roman Pontiff. Christ builds on real people, starting with one.