John Chrysostom
See how Christ leads Peter to a high understanding concerning himself. These things that He here promises to give him, belong to God alone, namely to forgive sins, and to make the Church immoveable amidst the storms of so many persecutions and trials.
Then He speaks of another honour of Peter, when He adds, And I will give thee the keys of the kingdom of heaven; as much as to say, As the Father hath given thee to know Me, I also will give something unto thee, namely, the keys of the kingdom of heaven.
He adds ‘of Philip,’ to distinguish it from the other Cæsarea, of Strato. And He asks this question in the former place, leading His disciples far out of the way of the Jews, that being set free from all fear, they might say freely what was in their mind.
He says not, Whom do the Scribes and Pharisees say that I am? but, Whom do men say that I am? searching into the minds of the common people, which were not perverted to evil. For though their opinion concerning Christ was much below what it ought to have been, yet it was free from wilful wickedness; but the opinion of the Pharisees concerning Christ was full of much malice.
The disciples having recounted the opinion of the common people, He then by a second question invites them to higher thoughts concerning Him, and therefore it follows, Jesus saith unto them, Whom say ye that I am? You who are with Me always, and have seen greater miracles than the multitudes, ought not to agree in the opinion of the multitudes. For this reason He did not put this question to them at the commencement of His preaching, but after He had done many signs; then also He spoke many things to them concerning His Deity.
When the Lord enquires concerning the opinion of the multitudes, all the disciples answer; but when all the disciples are asked, Peter as the mouth and head1 of the Apostles answers for all, as it follows, Simon Peter answered and said, Thou art Christ, the Son of the living God.
It would be without meaning to say, Thou art the son of Jonas, unless he intended to shew that Christ is as naturally the Son of God, as Peter is the son of Jonas, that is, of the same substance as him that begot him.
That is, On this faith and confession I will build my Church. Herein shewing that many should believe what Peter had confessed, and raising his understanding, and making him His shepherd.