Ummm … Sort of,
The entire subject is the Donatists, and mistakes with respect to them. Look at (2) and (3), Augustine says I made this kind of mistake, but it is still right. I caught the guilty man.
In the questionable passage, the translation uses peter and rock.
The Latin (in preserving the Greek original), uses ONE word with two different declensional endings. The preservation of the Greek is exact – both Peter and the foundation are ROCK.
In Latin, (the original), goto the link, choose Liber I, search for 276.
Same passage in Latin
hints:
Petr + us = rock as subject of sentence ( nominative singular, Second Declension = Masculine )
Petr + a = rock as subject of sentence ( Nominative singular, First declension )
Petr + am = rock as object of sentence ( Accusative, singular, First declension )
To anyone reading the biblical text in latin:
The neo vulgate: Mt 16:18, from the Vatican.
18 Et ego dico tibi: Tu es Petrus, et super hanc petram aedificabo Ecclesiam meam; et portae inferi non praevalebunt adversum eam.
Now, there is no question of Peter being ROCK.
Augustine is simply interpreting the passage in two ways.
The first is the one which others in the church are interpreting it.
The second is Augustine’s personal interpretation.
No matter which interpretation you choose, for the purpose of the Donatists, the condemnation of the Donatists will still stand.
So Augustine doesn’t bother to clarify the statement any more than to indicate in both cases, that Peter has the primacy.
I think you went awry when you asserted that the two interpretations are mutually exclusive, and that you would choose the second.
If I
had to choose between them, I would choose the first since the rest of the church accepted it already. Ambrose, by the way, is the bishop who taught Augustine and was instrumental in his conversion. Augustine is not quoting a peer, he is quoting a “Tradition”, to which he is bound by a teacher. The second interpretation is threrefore novel. (It may have something to do with Augustine knowing Greek, but not extremely well).
However, I do not believe the two interpretations are exclusive.
The second interpretation is from a different part of scripture, which makes a similar analogy where Christ is the foundation stone, then comes the 12 foundation stones of the apostles, then comes the building.