Peter is called the foundation of the church only in the same sense as all the apostles are called the foundation by the Apostle Paul, as the first preachers of the true faith concerning Jesus as the Christ and Son of God; and if the man who first professed that faith be honored by being called individually the rock, that only shows that the faith, and not the man, is after all the true foundation. That which makes Simon a Petros, a rock-like man, fit to build on, is the real Petra on which the Ecclesia is to be built.
After these remarks we deem it superfluous to enter minutely into the question to what the term “rock” refers in the sentence, “Thou art Peter, and on this rock I will build my church.” At the same time, we must say that it is by no means so clear to us that the rock must be Peter, and can be nothing else, as it is the fashion of modern commentators to assert. To the rendering, “Thou art Petros, a man of rock; and on thee, as on a rock, I will build my church,” it is possible, as already admitted, to assign an intelligible scriptural meaning. But we confess our preference for the old Protestant interpretation, according to which our Lord’s words to His disciple should be thus paraphrased: “Thou, Simon Barjonas, art Petros, a man of rock, worthy of thy name Peter, because thou hast made that bold, good confession; and on the truth thou hast now confessed, as on a rock, will I build my church; and so long as it abides on that foundation it will stand firm and unassailable against all the powers of hell.”God can forgive sins and strengthen the faith of those who love Him.