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It's all about his determination. You never, ever, give up once you start something, once you're on the trail of something you don't stop and that's what you have to go through when you're making a movie too. Once the train's rolling, you have to stick with it.

"Comic-Con 2011: Steven Spielberg and Peter Jackson Interview ADVENTURES OF TINTIN; Spielberg Says Jackson Is Scheduled to Shoot the Sequel". Interview with Jason Barr, collider.com. July 22, 2011.
It's all about his determination. You never, ever, give up once you start something, once you're on the trail of something you don't stop and that's what you have to go through when you're making a movie too. Once the