It wasn't Lyra's way to brood; she was a sanguine and practical child, and besides, she wasn't imaginative. No one with much imagination would have thought seriously that it was possible to come all this way and rescue her friend Roger; or, having thought it, an imaginative child would immediately have come up with several ways in which it was impossible. Being a practiced liar doesn't mean you have a powerful imagination. Many good liars have no imagination at all; it's that which gives their lies such wide-eyed conviction.
- from The Golden Compass by Philip Pullman