Well, whatever. I got it from IMDB, which said it was from the first Star Wars (A New Hope), which makes sense because that's the only one in which a planet actually gets destroyed.
I suppose normally I would disqualify you for making two guesses and post another quote, but it's not really a big deal. Go ahead and do your own quote.
Game on,
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"
He who is certain he knows the ending of things when he is only beginning them is either extremely wise or extremely foolish; no matter which is true, he is certainly an
unhappy man, for he has put a knife in the heart of wonder."
-- Tad Williams