This is a remarkable Catholic argument. It rests on a strictly literalist interpretation of Matthew's Gospel, it is thus 'sola scriptura'.It appears that binding and loosing are indeed powers of the keys, but I do not see where the keys themselves were given to anyone but Peter. So while James and John (the only two individuals other than Peter that appear, by context of the passage, to be present when Jesus spoke the words in Matthew 18) may have been authorized to share in the binding and loosing power, I see no reason to believe that they were given the keys to hold.
If we apply this Protestant view to the text we can say the keys are only explicitly noted as being with Peter, and only implied as being given to the others. Fortunately we have 'tradition' and the teachings of the Holy Fathers.
One, John Chrysostom says that the keys are held by the Apostle John...
"For (John) the Son of thunder, the beloved of Christ, the pillar of the Churches throughout the world, who holds the keys of heaven, who drank the cup of Christ, and was baptized with His baptism, who lay upon his Masters bosom, with much confidence, this man now comes forward to us now" Homilies on the Gospel of John. Preface to Homily 1.1
(emphasis added)
Augustine concurs that the whole church has the keys
"...the keys that were given to the Church..." A Treatise Concerning the Correction of the Donatists. Chapter 10.45
Now, some prophetic Scripture for meditation:
Isaiah 22
20 In that day I will summon my servant, Eliakim son of Hilkiah. 21 I will clothe him with your robe and fasten your sash around him and hand your authority over to him. He will be a father to those who live in Jerusalem and to the people of Judah. 22 I will place on his shoulder the key to the house of David; what he opens no one can shut, and what he shuts no one can open. 23 I will drive him like a peg into a firm place; he will become a seat of honor for the house of his father. 24 All the glory of his family will hang on him: its offspring and offshootsall its lesser vessels, from the bowls to all the jars.
There's great irony in Catholics now using this passage. It constitutes another remarkable Catholic following of Protestant teaching. The passage refers to a single key, not keys. It's regular use as pertaining to the 'keys' (plural) was done early last century by Protestants.
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