
that is all he did. These object lessons should teach us that ninety-nine parts of all things that proceed from the intellect are plagiarisms, pure and simple; and the lesson ought to make us modest. But nothing can do that.
Letter to Helen Keller, after she had been accused of plagiarism for one of her early stories (17 March 1903), published in Mark Twain's Letters, Vol. 1 (1917) edited by Albert Bigelow Paine, p. 731