Oh boy...that's a hard one! I don't think I have ONE quote I can point to. I quote books and (slightly more infrequently), movies, all the time. The ones that I quote the most are probably The LotR books, The four Dorthy Sayers Peter Wimsey/Harriet Vane mystery books, and the film
It's a Wonderful Life. But to try to name single quotes? Way, way too hard. So, I guess I pass that question on, since I can't answer it
What is a quotation from a book or movie that you use frequently?