We've learned that Jesus taught people by speaking to large crowds like the Sermon on the Mount, taught people using parables, performed many miracles and had chosen his 12 Apostles to follow him wherever he went.
When Jesus was going around doing miracles and speaking to people, they did not know he was the son of God.
Most people thought he was a prophet, or just someone that taught God's word and did miracles for God.
Even his own Apostles didn't really know for a while that he was God's son!
One day Jesus was talking to his apostles and he asked them who the people in all the towns thought was the Son of Man.
By Son of Man he meant God's son who was born as a person.
They answered that some people thought it was John the Baptist, the person who had come before Jesus to tell people that Jesus was coming soon.
Some other people from the towns thought it was Elijah, Jeremiah or one of the prophets that lived long ago and were written about in the books of the Old Testament.
Jesus then asked his apostles who they thought Jesus was.
His apostle Peter said that Jesus was the Messiah, the Son of the living God.
Jesus said that because Peter was the one who came forward to say that Jesus was the Messiah, he would be the one that Jesus would use to help build his church.
He called Peter a rock meaning he was a very strong foundation for the church, and said that he would give him the keys to the kingdom of heaven.
Jesus then told all of his apostles not to tell anyone else that he was the Messiah.
(from: wikipedia - confession of peter)
Kid Facts - Blast from the past: Jesus' Apostles - Andrew and Simon Peter
