Catena Aurea on Matthew 16:13–19: Augustine of Hippo

I have said in a certain place of the Apostle Peter, that it was on him, as on a rock, that the Church was built. but I know that since that I have often explained these words of the Lord, “Thou art Peter, and on this rock will I build my Church,” as meaning upon Him whom Peter had confessed in the words, “Thou art Christ, the Son of the living God;: and so that Peter, taking his name from this rock, would represent the Church, which is built upon this rock. For it is not said to him, Thou art the rock, but, “Thou art Peter.” But the rock was Christ, [1 Cor 10:4] whom because Simon thus confessed, as the whole Church confesses Him, he was named Peter. Let the reader choose whether of these two opinions seems to him the more probable.