"Logic could only take you so far, then you had to get out and walk."
— Terry Pratchett, The Last Continent
"I cannot - yet I must! How do you calculate that? At what point on the graph do 'must' and 'cannot' meet?"
—Ro-Man, Robot Monster
"Logic, logic, logic. Logic is the beginning of wisdom, not its end."
Bob: It was really more foolish than that. I used to ask myself — why doesn't she love me?
Mary: You asked yourself - that?
Bob: All the time.
Mary: (Throws bedclothes on sofa, exploding.) That's why I hate intellectuals! They're all so dumb!
"Like all cyborgs I am unhampered by emotions unless required otherwise by lazy scriptwriters."
"Chaos and optionality, which to these days governed the historical and political ideas, have been replaced by a stunningly uniform and harmonious scientific theory."
"Logic is like the sword — those who appeal to it, shall perish by it."
"Logic is a poor guide compared with custom."
"Logic, like whiskey, loses its beneficial effect when taken in too large quantities."
"I've never been a fan of books. I don't trust them. They're all fact and no heart."
—Stephen Colbert, parodying this trope
"Consider Mr. Spock of Star Trek, a naive archetype of rationality. Spock's emotional state is always set to 'calm', even when wildly inappropriate. He often gives many significant digits for probabilities that are grossly uncalibrated. (E.g: "Captain, if you steer the Enterprise directly into that black hole, our probability of surviving is only 2.234%" Yet nine times out of ten the Enterprise is not destroyed. What kind of tragic fool gives four significant digits for a figure that is off by two orders of magnitude?) Yet this popular image is how many people conceive of the duty to be "rational"—small wonder that they do not embrace it wholeheartedly.
— Eliezer Yudkowsky, Why Truth? And...
"It was whilst Tuvok was dismissing Paris’ suggestions of recreating Vulcan that I realised he was now by far the most boring character on this show. He rejects any attempt at humour, fails to acknowledge the beauty and wonder of space travel and has become little more than a humourless, one note joke that all of the characters have a kick at eventually. I pity poor Tim Russ who on the few occasions gets to do something different proves to be an excellent actor but considering that is once every three seasons you would never be able to tell if you took a glance at the series as a whole."
"Oh dear, I really don't think I'm going to like this T'Pol. I've found that Vulcans can run the gamut from mellow (Saavik, Voyager's sadly underused Vorik) to gruff (Tuvok, Sarek) to kind of sassy (Spock, Valeris), all under the guise of logic and restrained emotion. They're my favourite Trek species, actually. What can I say? A large part of me has to relate to the guy standing at the back of the room with his armed folded, rolling his eyes at everyone. I don't think I've ever met one I didn't like. Until now."