Matthew 16:13ff

Careful reading we can see Christ changes the identity of Peter, from Just a fleshly of this earth man to a rock in the spirit. 
We can see that Jesus said it would be on the rock of this truth, the changed life of the believer He would build his church. 
Because of the change life in the believe we have been given the keys to the kingdom of God and what every we loose on this earth or bind will be loose or bound in heaven.
Our new nature gives us authority 

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