Peter here professes his faith in Jesus as the Son of God. Jesus gives the keys of the Kingdom to him, that is, the authority to rule over the church as pope. Pope Benedict XVI continues this ministry of governance that Jesus entrusted to St. Peter.
13 Jesus went into the region of Caesarea Philippi he asked his disciples, “Who do people say that the Son of Man is?” 14 They replied, “Some say John the Baptist, others Elijah, still others Jeremiah or one of the prophets.” 15 He said to them, “But who do you say that I am?” 16 Simon Peter said in reply, “You are the Messiah, the Son of the living God.” 17 Jesus said to him in reply, “Blessed are you, Simon son of Jonah. For flesh and blood has not revealed this to you, but my heavenly Father. 18 And so I say to you, you are Peter, and upon this rock I will build my church, and the gates of the netherworld shall not prevail against it. 19 I will give you the keys to the kingdom of heaven. Whatever you bind on earth shall be bound in heaven; and whatever you loose on earth shall be loosed in heaven.” 20 Then he strictly ordered his disciples to tell no one that he was the Christ. 21 From that time on, Jesus began to show his disciples that he must go to Jerusalem and suffer greatly from the elders, the chief priests, and the scribes, and be killed and on the third day be raised. 22 Then Peter took him aside and began to rebuke him, “God forbid, Lord! No such thing shall ever happen to you.” 23 He turned and said to Peter, “Get behind me, Satan! You are an obstacle to me. You are thinking not as God does, but as human beings do.”
t h i n k : Let us be people of faith and not people who continually complain to God.