The quote you are referring to was stated by the character Rhett Butler in the 1939 Oscar winning film, "Gone With The Wind." The film, based on the novel of the same title by Margaret Mitchell, is considered by many movie historians as one of the top five films of all time. Taking away Academy Awards for Best Picture and Best Screenplay (Sidney Howard, writer) along with a host of others, the film is a true classic. Aside from the famous quote you referred to, other famous movie quotes include: "With enough courage, you can do without a reputation," "I can shoot straight, if I don't have to shoot too far," and "After all... tomorrow is another day."
Sidney Howard was awarded the Academy Award for Best Screenplay posthumously as he died tragically in a farming accident during the summer of 1939. He was a prolific writer, having written for the stage and the screen, although there are those that argue with such strong source material as Mitchell's novel, Howard had very little creative work to do. But for those that have attempted to adapt famous novels into movies, the task is no "gimme."
The character Rhett Butler was portrayed by Clark Gable in perhaps the most iconic role in film history. Some historians believe the reason Gable lost out on the Best Acting nod--losing to Robert Donat for his role in "Goodbye, Mr Chips"--was that he never really had to act, he simply showed up and read the lines as himself. This characterization may be a bit over simplified, and based on the longevity of the popularity of the movie and the memorable quotes attributed to Gable's Butler, the role has definitely etched a chasm of significant depth through the ages of movie making and movie appreciation over the years.
The film itself, Directed by Victor Fleming, is a marvel of sight and sound. Color films were just beginning to make their way into the mainstream, and at an unprecedented 226 minutes, the film was truly a spectacle to behold. The studio, MGM, took a major risk releasing the film that was so long, but with a tremendous budget already spent, the studio executives felt it was better to risk it based on the enormous popularity of the book and the novelty of color film.
Have other films generated such a plethora of famous movie quotes? Certainly, there have been many quotable films through the history of cinema, but time will tell if the number of famous movie quotes generated by other films will endure as long as those from "Gone With The Wind."
The other Academy Awards awarded to "Gone With The Wind" included: Best Actress, Vivien Leigh; Supporting Actress, Hattie McDaniel (the first African-American to be nominated and win, and first to be invited to the awards); Best Art Direction, Lyle Wheeler; Best Cinematography, Ernest Haller and Ray Rennahan; and Best Film Editing, Hal Kern and James Newcom. It also received four other nominations in addition to Gable's Best Actor.