It is undoubtedly the doctrine of Scripture that Christ is the only foundation [of the Church]: “other foundation can no man lay than that is laid, which is Jesus Christ” (1 Cor 3:11). Yet we must remember that the same metaphor may be used to illustrate different truths, and so, according to circumstances, may have different significations. The same Paul who has called Christ the only foundation, tells his Ephesian converts (2:20):–“Ye are built upon the foundation of the Apostles and Prophets, Jesus Christ himself being the chief corner-stone.” And in like manner we read (Rev 21:14) :–“The wall of the city had twelve foundations, and on them the names of the twelve Apostles of the Lamb.” How is it that there can be no other foundation but Christ, and yet that the Apostles are spoken of as foundations? Plainly because the metaphor is used with different applications. Christ alone is that foundation, from being joined to which the whole building of the Church derives its unity and stability, and gains strength to defy all the assaults of hell. But, in the same manner as any human institution is said to be founded by those men to whom it owes its origin, so we may call those men the foundation of the Church whom God honoured by using them as His instruments in the establishment of it; who were themselves laid as the first living stones in that holy temple, and on whom the other stones of that temple were laid; for it was on their testimony that others received the truth, so that our faith rests on theirs; and (humanly speaking) it is because they believed that we believe. So, again, in like manner, we are forbidden to call anyone on earth our Father, “for one is our Father which is in heaven.” And yet, in another sense, Paul did not scruple to call himself the spiritual father of those whom he had begotten in the Gospel. You see, then, that the fact that Christ is called the rock, and that on Him the Church is built, is no hindrance to Peter’s also being, in a different sense, called rock, and being said to be the foundation of the Church; so that I consider there is no ground for the fear entertained by some, in ancient and in modern times, that, by applying the words personally to Peter, we should infringe on the honour due to Christ alone.
By the way, that was from Stephen Ray.