Jesus Christ tells us, “Upon this rock will I build my Church.” What did the Lord Jesus Christ mean when He spoke of this foundation? Did He mean the Apostle Peter, to whom He was speaking? I think assuredly not. I can see no reason, if He meant Peter, why He did not say, “Upon you” will I build my Church. If He had meant Peter, He would surely have said, I will build my Church on you, as plainly as He said, “to you will I give the keys.”—
No, it was not the person of the Apostle Peter, but the good confession which the Apostle had just made! It was not Peter, the erring, unstable man, but the mighty truth which the Father had revealed to Peter. It was the truth concerning Jesus Christ Himself which was the rock. It was Christ’s Mediatorship, and Christ’s Messiahship. It was the blessed truth that Jesus was the promised Saviour, the true Surety, the real Intercessor between God and man. This was the rock, and this the foundation, upon which the Church of Christ was to be built.
The foundation of the true Church was laid at a mighty cost. It needed that the Son of God should take our nature upon Him, and in that nature live, suffer, and die, not for His own sins, but for ours. It needed that in that nature Christ should go to the grave, and rise again. It needed that in that nature Christ should go up to heaven, to sit at the right hand of God, having obtained eternal redemption for all His people.
No other foundation could have met the necessities of lost, guilty, corrupt, weak, helpless sinners. That foundation, once obtained, is very strong. It can bear the weight of the sins of all the world. It has borne the weight of all the sins of all the believers who have built on it. Sins of thought, sins of the imagination, sins of the heart, sins of the head, sins which everyone has seen, and sins which no man knows, sins against God, and sins against man, sins of all kinds and descriptions—that mighty rock can bear the weight of all these sins, and not give way. The mediatorial office of Christ is a remedy sufficient for all the sins of all the world.