How does that support sola scriptura?
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If we believe that the Lord has spoken, then we should believe what the Lord has said.
What’s so bad about wanting God’s own words to be the foundation of our faith?
Even the words of John 6?
Even the words that Christ spoke from the Cross giving his mother to John, the apostle, which means that he had no brothers or sisters, or else the custom would have been to give his mother to one of them????
I don’t think you know the meaning of the phrase “sola scriptura.”