"You want weapons? We're in a library. Books are the best weapon in the world. This room's the greatest arsenal we could have. Arm yourself!" 
                    -The Doctor

"There's something that doesn't make sense. Let's go and poke it with a stick."
                           - The Doctor
"The universe is big, its vast and complicated, and ridiculous. And sometimes, very rarely, impossible things just happen and we call them miracles. And that's the theory. Nine hundred years, never seen one yet, but this would do me."
                           - The Doctor