Matthew 16:16 - Ellicott's Commentary On The Whole Bible

Thou art the Christ, the Son of the living God. — The variations in the other Gospels — St. Mark giving simply, “Thou art the Christ,” and St. Luke, “The Christ of God” — are interesting in their bearing on the question of literal inspiration, but do not affect the meaning; and the fullest of the three reports may be received without hesitation as the most authentic. The confession was made by Peter, partly, we may believe, as the representative of the others, partly, as the special promise that follows implies, from the personal fervour of his character. He believed himself, and had impressed his faith on them. His words reproduced the confession of John 6:69, even verbally, if we follow the received text, but the better MSS. of that Gospel have a different reading: “Thou art the Holy One of God.” In any form they recognised to the full our Lord’s character as the Christ; they identified Him with the Son of Man in Daniel’s vision, and, more than this, they recognised in that Son of Man one who was also not “a son” only, but, in some high incommunicable sense, “the Son of the living God.”