The quote is from a “Sermon” of Luther on John, not “Commentary” as Some Catholic cite it as. He did say it, although the hard core Lutherans will say Catholics are quoting this out of context, and say something to the effect that what Luther was saying was he learned much from the Church of his day which was Catholic under the Bishop of Rome, of course ones context is usually based on ones ex ante assumptions. They will protest any notion that Luther was conceding any infallibility to Rome with respect to Rome having defined the Canon correctly. Remember, he wanted James out of the NT canon and of course rejected the Deuterocanonicals, which both Rome and Orthodoxy have in their canons [although some Orthodox have more of them then other Orthodox Churches and Rome].
Well of course Luther didn't cede that Rome had the correct scripture...Luther used manuscripts rejected by Rome to construct his bible...That's because Luther rejected much of the Catholic version of the bible...
I don't think you have to be 'hard-core' to say it is taken out of context, just honest, because it is.
It just shows Luther’s ignorance of history, since he was obviously dealing with what the RCC told him.
God gave us Scripture. The OT was not given us by the Catholic church but rather through the Jews.
The NT was written as men were moved along by the Holy Spirit as it was God breathed.
The absolute most that the Catholic church might be able to take credit for is compiling it into one handy source, and even that didn’t require any great intellectual feat. It would have happened eventually. Someone would have thought of it and done it.
But that does not give anyone the right to claim that they are responsible for giving the world the word of God.