It was obviously a bit like the scene in "Life of Brian" where the character, played by Michael Palin I believe, speaks of :
"The highest wanking officer in the wo-man army" He had trouble with his "Rs".
The bit of "Gospel" that always jarred with me was where "Mathew" puts in "let the reader use discernment".
If the reader did that he wouldn't believe a word of it !