Bale on Batman's Evolution

How does Christian Bale plan on keeping the role of Bruce Wayne/Batman interesting and new?
"You have to keep on moving forward and pressing on and finding new and impressive character points and storylines, but I've got real confidence," said actor Christian Bale talking with If Magazine about doing more Batman films with director Christopher Nolan. "I think that Chris is such a smart man and when I did finally get into the game I would have certain questions about why he was doing something and not quite understanding it. He would explain it to me and it would be like, 'Now that he's said it's so obvious. That really works. Yeah.' So I have great faith in him that he will be pulling something out of the hat that will be even better than the first one."
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iF Magazine