Outside of these unimportant variants, there are a couple variants of some importance. The two most commonly cited examples are the last verses of the "Gospel of Mark" and the story of the adulterous woman in the "Gospel of John". Many scholars and critics also believe that the Comma Johanneum reference supporting the Trinity doctrine in 1 John to have been a later addition. According to Norman Geisler and William Nix, "The New Testament, then, has not only survived in more manuscripts than any other book from antiquity, but it has survived in a purer form than any other great book—a form that is 99.5% pure"