*Minor differences ignored. Grouped by changes, with first version listed as example.
Thou art the Christ. The confession is short, but it embraces all that is contained in our salvation; for the designation Christ, or Anointed, includes both an everlasting Kingdom and an everlasting Priesthood, to reconcile us to God, and, by expiating our sins through his sacrifice, to obtain for us a perfect righteousness, and, having received us under his protection, to uphold and supply and enrich us with every description of blessings. Mark says only, Thou art the Christ. Luke says, Thou art the Christ of God But the meaning is the same; for the Christs (christoi) of God was the appellation anciently bestowed on kings, who had been anointed by the divine command. [1] And this phrase had been previously employed by Luke, (2:26,) when he said that Simeon had been informed by a revelation from heaven that he would not see death before he had seen the Lord's Christ For the redemption, which God manifested by the hand of his Son, was clearly divine; and therefore it was necessary that he who was to be the Redeemer should come from heaven, bearing the impress of the anointing of God. Matthew expresses it still more clearly, Thou art the Son of the living God; for, though Peter did not yet understand distinctly in what way Christ was the begotten of God, he was so fully persuaded of the dignity of Christ, that he believed him to come from God, not like other men, but by the inhabitation of the true and living Godhead in his flesh. When the attribute living is ascribed to God, it is for the purpose of distinguishing between Him and dead idols, who are nothing, (1-Corinthians 8:4.)
1 - See Harmony, [24]vol. 1, p. 92, n. 2; [25]p. 142, n. 2.
And Simon Peter answered - Peter, expressing the views of the apostles, with characteristic forwardness answered the question proposed to them by Jesus: "Thou art the Christ, the Son of the living God."
The Christ - The Messiah, the "Anointed" of God. See the notes at Matthew 1:1.
The Son - That is, the Son by way of eminence - in a special sense. See the notes at Matthew 1:17. This appellation was understood as implying divinity, John 10:29-36.
Of the living God - The term "living" was given to the true God to distinguish him from idols, that are dead, or lifeless blocks and stones. He is also the Source of life, temporal, spiritual, and eternal. The word "living" is often given to him in the Old Testament, Joshua 3:10; 1-Samuel 17:26, 1-Samuel 17:36; Jeremiah 10:9-10, etc. In this noble confession Peter expressed the full belief of himself and of his brethren that he was the long-expected Messiah. Other people had very different opinions of him, but they were satisfied, and were not ashamed to confess it.
Thou art the Christ, the Son of the living God - Every word here is emphatic - a most concise, and yet comprehensive, confession of faith.
The Christ, or Messiah, points out his divinity, and shows his office; the Son - designates his person: on this account it is that both are joined together so frequently in the new covenant. Of the living God Του Θεου, του ζωντος, literally, of God the Living One. The C. Bezae has for Του ζωντος the Living One, Του σωζοντος, the Savior, and the Cant. Dei Salvatoris, of God the Savior.
Living - a character applied to the Supreme Being, not only to distinguish him from the dead idols of paganism, but also to point him out as the source of life, present, spiritual, and eternal. Probably there is an allusion here to the great name יהוה Yeve, or Yehovah, which properly signifies being or existence.
And Simon Peter answered and said,.... Either of his own accord, and for himself, being a warm, zealous, and forward man; one that dearly loved Christ, truly believed in him, and was ready to make a confession of him; or, as the mouth of the rest, in their name, and with their consent; or, at least, as full well knowing the sentiments of their minds. Thou art Christ, the Son of the living God: a short, but a very full confession of faith, containing the following articles: as that there is a God, that there is but one God; that he is the living God, has life in himself, is the fountain of life to others, and by this is distinguishable from the idols of the Gentiles: that Jesus is the Christ, the Christ of God, the true Messiah, that was promised by God, prophesied of by all the prophets, from the beginning of the world, and expected by the people of God: a character that includes all his offices, of prophet, priest, and king, to which he is anointed by God; and that this Messiah was not a mere man, but a divine person, the Son of God; not by creation, as angels and men are, nor by adoption, as saints, nor by office, as magistrates, but by nature, being his own Son, his proper Son, the only begotten of the Father, of the same nature with him, being one with him, and equal to him. This confession, as it is uniform, and all of a piece, and consistent with itself, and is what all the disciples of Christ agreed in, so it greatly exceeds the most that can be made of the different sentiments of the people put together. They took him, one and all, to be but a mere man; their most exalted thoughts of him rose no higher: but in this he is acknowledged to be the Son of God, a phrase expressive of his divine nature, and distinct personality: they thought him to be a dead man brought to life; but here he is called the Son of the living God, as having the same life in him the Father has: they indeed judged him to be a prophet, but not that prophet that was to come, superior to all prophets; but here he is owned to be the Christ, which not only takes in his prophetic office in a higher sense than they understood it, but all his other offices, and declares him to be the promised Messiah; which they who thought, and spoke the most honourably of him, could not allow of.
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 Matthew 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.
And Peter answered. With the impetuosity and impulsiveness that were ever manifest 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.
Peter - Who was generally the most forward to speak.
*More commentary available at chapter level.