And Simon Peter answered and said, Thou art the Christ, the Son of the living God.

People's New Testament

16:16 And Simon Peter answered. With the impetuosity and impulsiveness that were ever manifested in him, Peter replied at once and expressed the faith of all the apostolic band.

Thou art the Christ, the Son of the living God. This confession not only sees in Jesus the promised Messiah, but in the Messiah recognizes the divine nature. The confession of Peter is the one Christian confession of the New Testament and of the apostolic age, and the very foundation of the church, into which all saints are built as living stones of the temple.

Wesley's Notes

16:16 Peter - Who was generally the most forward to speak.

Jamieson-Fausset-Brown Bible Commentary

16. And Simon Peter answered and said, Thou art the Christ, the Son of the living God-He does not say, "Scribes and Pharisees, rulers and people, are all perplexed; and shall we, unlettered fishermen, presume to decide?" But feeling the light of his Master's glory shining in his soul, he breaks forth-not in a tame, prosaic acknowledgment, "I believe that Thou art," &c.-but in the language of adoration-such as one uses in worship, "Thou Art the Christ, the Son of the Living God!" He first owns Him the promised Messiah (see on [1316]Mt 1:16); then he rises higher, echoing the voice from heaven-"This is My beloved Son, in whom I am well pleased"; and in the important addition-"Son of the Living God"-he recognizes the essential and eternal life of God as in this His Son-though doubtless without that distinct perception afterwards vouchsafed.

Matthew Henry's Concise Commentary

16:13-20 Peter, for himself and his brethren, said that they were assured of our Lord's being the promised Messiah, the Son of the living God. This showed that they believed Jesus to be more than man. Our Lord declared Peter to be blessed, as the teaching of God made him differ from his unbelieving countrymen. Christ added that he had named him Peter, in allusion to his stability or firmness in professing the truth. The word translated rock, is not the same word as Peter, but is of a similar meaning. Nothing can be more wrong than to suppose that Christ meant the person of Peter was the rock. Without doubt Christ himself is the Rock, the tried foundation of the church; and woe to him that attempts to lay any other! Peter's confession is this rock as to doctrine. If Jesus be not the Christ, those that own him are not of the church, but deceivers and deceived. Our Lord next declared the authority with which Peter would be invested. He spoke in the name of his brethren, and this related to them as well as to him. They had no certain knowledge of the characters of men, and were liable to mistakes and sins in their own conduct; but they were kept from error in stating the way of acceptance and salvation, the rule of obedience, the believer's character and experience, and the final doom of unbelievers and hypocrites. In such matters their decision was right, and it was confirmed in heaven. But all pretensions of any man, either to absolve or retain men's sins, are blasphemous and absurd. None can forgive sins but God only. And this binding and loosing, in the common language of the Jews, signified to forbid and to allow, or to teach what is lawful or unlawful.