 Among Bulwer-Lytton's lesser-known contributions to literature was that he convinced Charles Dickens to revise the ending of "Great Expectations" to make it more palatable to the reading public, as in the original version of the novel, Pip and Estella do not get together.Bulwer-Lytton's most famous quotation is "The pen is mightier than the sword" from his play "Richelieu"