Greebo

“The trouble with having an open mind, of course, is that people will insist on coming along and trying to put things in it.”
― Terry Pratchett, Diggers

“If cats looked like frogs we'd realize what nasty, cruel little bastards they are. Style. That's what people remember.”
― Terry Pratchett, Lords and Ladies

“Some humans would do anything to see if it was possible to do it. If you put a large switch in some cave somewhere, with a sign on it saying 'End-of-the-World Switch. PLEASE DO NOT TOUCH', the paint wouldn't even have time to dry.”
― Terry Pratchett, Thief of Time

“For instance, on the planet Earth, man had always assumed that he was more intelligent than dolphins because he had achieved so much—the wheel, New York, wars and so on—whilst all the dolphins had ever done was muck about in the water having a good time. But conversely, the dolphins had always believed that they were far more intelligent than man—for precisely the same reasons.”
― Douglas Adams, The Hitchhiker's Guide to the Galaxy