Quotes From "Doctor Who: The Shooting Scripts" By Steven Moffat

What's the point of being a grown-up if you don't...
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What's the point of being a grown-up if you don't get to be immature? Steven Moffat
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Because every time you see them happy you remember how sad they're going to be. And it breaks your heart. Because what's the point in them being happy now if they're going to be sad later. The answer is, of course, because they a re going to be sad later. Steven Moffat