Jesus gave His Autority to the Apostles to loose and to bind and then breathed on them the Holy Spirit.
The Lord gave authority to the Apostles to loose and to bind the evil and false ideas in themself. that was the power He gave them. In the middle ages the church had the wrong idea about what the Lord was saying, concerning given authority to them. They burnt anyone who disgrees with the church. The authority wasn’t given to be over others, but over ones own evil and false ideas about God. To blind means to send back to hell. By sending back to hell means the evil spirit cannot tempt the person who has the power.