Matthew 16: 19-20 The Keys to the Kingdom
Once the Church became institutional it began to teach that "what you bind on earth will be bound in Heaven" as something to do with membership or forgiveness of sin and confession. But I think that Jesus was thinking more in terms of whatever you do as a public leader, Peter, will affect the hearts of others. That is, the Kingdom is within. It is not the church institution and it is not up in the sky in some other world. It is within. To have the "key" means that your actions will affect the spiritual life of other people. So be careful what you do as a public leader. The institution cannot excommunicate people from God who is within and stays in the heart regardless of external rulings. But external rulings can nevertheless upset the heart of the person so affected.