Well, now that same quote is the subject of a huge lawsuit by Faulkner’s estate against Sony, which made the movie Midnight in Paris.
““Sony did not have Faulkner’s consent to appropriate William Faulkner’s name or his works for Sony’s advantage,” it adds. In Midnight In Paris, Gil Pender, the disillusioned Hollywood screenwriter played by Owen Wilson, says, “the past is not dead. Actually, it’s not even past. You know who said that? Faulkner. And he was right. And I met him, too. I ran into him at a dinner party.” The rightsholder say the slightly paraphrased quote could “deceive the infringing film’s viewers as to a perceived affiliation, connection or association between William Faulkner and his works, on the one hand, and Sony, on the other hand.”
Sony considers the lawsuit frivolous. I'm no lawyer, but I will say using a dozen words from a book seem to fall under "fair use."