Forgive me if this idea has already been expressed another way, but it strikes me off the bat that it might be along the line of when Joseph tried to describe the glory of God. He simply said that it "defied all description".
If it is the case that there are things one can behold that the human mind and tongue are unequal to decribing (though the mind clearly knows what it saw) then perhaps there are also words and concepts that though understood literally cannot be repeated. This may be another one of those situations where we are too limited to understand how this might occur but my guess is that it is akind to when you are searching for a word that captures an idea and just can't find it. In this case there just are no words you can regurgitate.
Either that, or it is just code for that fact that trying to take notes on brass plates gives you one hell of a cramp and you tire out. "Nephi, did you hear that? Aren't you going to write that down?"
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The Bible tells us how to go to heaven, not how the heavens go. -Galileo
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