Footnote

a Augustine (354-430 C.E.), usually called “Saint Augustine,” at one time believed that Peter was the rock-mass but later changed his view. He wrote: “The rock is not so named from Peter, but Peter from the rock (non enim a Petro petra, sed Petrus a petra), even as Christ is not so called after the Christian, but the Christian after Christ. For the reason with the Lord says, ‘On this rock I will build my church,’ is that Peter had said: ‘Thou art the Christ, the Son of the living God.’ On this rock, which thou hast confessed, says he, I will build my church. For Christ was the rock (petra enim erat Christus), upon which also Peter himself was built; for other foundation can no man lay, than that is laid, which is Jesus Christ.”