This is technically not a book but rather a letter linked to a book, written by Aldous Huxley to George Orwell regarding 1984. It highlights the difference in the principles and philosophies that guide the totalitarian governments of Huxley's "Brave New World" and Orwell's "Nineteen Eighty-Four":
Within the next generation I believe that the world’s rulers will discover that infant conditioning and narco-hypnosis are more efficient, as instruments of government, than clubs and prisons, and that the lust for power can be just as completely satisfied by suggesting people into loving their servitude as by flogging and kicking them into obedience.