Why was Peter’s confession of Christ so significant in Matthew 16:16?

Today Bible Study:

Why was Peter’s confession of Christ so significant in Matthew 16:16?

To call Jesus the Son of “the living God” was an Old Testament name for God. Never before had He explicitly taught Peter and the apostles the fullness of His identity. God the Father had opened Peter’s eyes to the full significance of those claims (v.17), and revealed to him who Jesus really was. Peter was not merely expressing an academic opinion about the identity of Christ; this was a confession of Peter’s personal faith, made possible by a divinely regenerated heart.

Jesus said that “you are Peter, and on this rock I will build My church” (v. 18). The word for “Peter,” Petros, means a small stone (John 1:42). Jesus used a play on words here with petra, which means a foundation boulder (see 7:24, 25). Since the New Testament makes it abundantly clear that Christ is both the foundation (Acts 4:11, 12; 1 Cor. 3:11) and the head (Eph. 5:23) of the church, it is a mistake to think that here He is giving either of those roles to Peter. There is a sense in which the apostles played a foundational role in the building of the church (Eph. 2:20), but the role of primacy is reserved for Christ alone, not assigned to Peter. So Jesus’ words here are best interpreted as a simple play on words in that a boulder-like truth came from the mouth of one who was called a small stone. Peter himself explains the imagery in his first epistle: the church is built of “living stones” (1 Pet. 2:5) who, like Peter, confess that Jesus is the Christ, the Son of the living God. And Christ Himself is the “chief cornerstone” (1 Pet. 2:6, 7).