@amog32 It's only in the movie,really? I remember it so well I really thought it was also from the book, huh. Still, that makes sense then. As you said the whole series had been played out by this time, and the quote is more applicable to everything because of it.
@Happyrock true. I believe this quote is only in the 3rd movie, too, not the book. which makes the fact that it applies to the whole series so well even more true, since the screenplay was written after the books, and the screenwriter knew of the troubles and triumphs to come.