Matthew 16:19

And I will give unto you the keys of the kingdom of heaven: and whatsoever you shall bind on earth shall be what has been bound in heaven: and whatsoever you shall loose on earth shall be what has been loosed in heaven.
All Commentaries on Matthew 16:19 Go To Matthew 16

Rabanus Maurus

AD 856
And by a remarkable distinction it was that the Lord Himself puts forward the lowliness of the humanity which He had taken upon Him, while His disciple shews us the excellence of His divine eternity. The gates of hell are the torments and promises of the persecutors. Also, the evil works of the unbelievers, and vain conversation, are gates of hell, because they show the path of destruction. For as with a zeal beyond the others he had confessed the King of heaven, he is deservedly entrusted more than the others with the keys of the heavenly kingdom, that it might be clear to all, that without that confession and faith none ought to enter the kingdom of heaven. By the keys of the kingdom He means discernment and power; power, by which he binds and looses; discernment, by which he separates the worthy from the unworthy. It follows, “And whatsoever thou shalt bind;” that is, whomsoever thou shalt judge unworthy of forgiveness while he lives, shall be judged unworthy with God; and “whatsoever thou shalt loose, "that is, whomsoever thou shalt judge worthy to be forgiven while he lives, shall obtain forgiveness of his sins from God. But this power of binding and loosing, though it seems given by the Lord to Peter alone, is indeed given also to the other Apostles, and is even now in the Bishops and Presbyters in every Church. But Peter received in a special manner the keys of the kingdom of heaven, and a supremacy of judicial power, that all the faithful throughout the world might understand that all who in any manner separate themselves from the unity of the faith, or from communion with him, such should neither be able to be loosed from the bonds of sin, nor to enter the gate of the heavenly kingdom.
2 mins

Knowing this first, that no prophecy of the scripture is of any private interpretation - 2 Peter 1:20

App Store LogoPlay Store Logo