And Jesus came into the quarters of Cesarea Philippi: and he asked his disciples, saying: "Whom do men say that the Son of man is?" But they said: "Some John the Baptist, and other some Elias, and others Jeremias, or one of the prophets." Jesus saith to them: "But whom do you say that I am?" Simon Peter answered and said: "Thou art Christ, the Son of the living God." And Jesus answering said to him: "Blessed art thou, Simon Bar-Jona: because flesh and blood hath not revealed it to thee, but my Father who is in heaven. And I say to thee: That thou art Peter; and upon this rock I will build my church, and the gates of hell shall not prevail against it. And I will give to thee the keys of the kingdom of heaven. And whatsoever thou shalt bind upon earth, it shall be bound also in heaven: and whatsoever thou shalt loose on earth, it shall be loosed also in heaven." (Matt. 16:13-19)
WITNESSES FOR THE DIVINITY OF CHRIST: 1. Peter testified that Jesus was the Son of the living God. 2. Our Lord accepted and ratified this confession of faith, by calling Himself the Son of the Father who is in heaven, and by calling Peter 'blessed' on account of his faith in His Divinity. 3. Our Lord acted and spoke as God, by giving Peter the keys of the kingdom of heaven, and by promising him a continuous power of binding and loosing--a power which, obviously, only God could give.
[From 'A Practical Commentary on Holy Scripture' by Bishop Knecht, D.D.]
(1899 Douay-Rheims Bible)