Amanda: And you, Sarek, would you also say thank you to your son?
Sarek: I don't understand.
Amanda: For saving your life.
Sarek: Spock acted in the only logical manner open to him. One does not thank logic, Amanda.
Amanda: Logic! Logic! I'm sick to death of logic! Do you want to know how I feel about your logic?
Spock: Emotional, isn't she?
Sarek: She has always been that way.
Spock: Indeed. Why did you marry her?
Sarek: At the time it seemed the logical thing to do.
McCoy: Spock, I've always suspected you were a little more human than you let on. Mrs. Sarek, I know about the rigorous training of the Vulcan youth, but tell me, did he ever run and play like the human children, even in secret?
Amanda: Well, he, uh, he did have a pet Sehlat he was very fond of.
Amanda: It's sort of a... a fat teddy bear.
McCoy: [grinning] A teddy bear?
Sarek: Excuse me, Doctor. It has been a rather long day for my wife. Captain.
Captain James T. Kirk: Ambassador.
McCoy: [needlingly Spock after Sarek and Amada have gone] "A teddy bear."
Spock: Not precisely, Doctor. On Vulcan the "teddy bears" are alive, and they have 6-inch fangs
McCoy: Mrs. Sarek, you must understand the chances are extremely small to find a way to produce sufficient T-negative blood.
Spock: Indeed. I would estimate the odds...
Amanda: [exasperated] Please don't!
Captain James T. Kirk: [orbiting Vulcan] Mr. Spock, we'll leave orbit in two hours. Would you care to beam down and visit your parents?
Spock: Captain, Ambassador Sarek and his wife ARE my parents.
Amanda: After all these years with humans, you still haven't learned to smile.
Spock: Humans smile with so little provocation.
McCoy: How does that Vulcan salute go?
McCoy: That hurts worse than the uniform.
McCoy: [Captain Kirk is adjusting uniform in mirror, Dr. McCoy pacing behind him, tugging at tight collar] Dress uniforms - spit and polish. I don't know how much longer I'm gonna be able to stand this. I feel like my neck's in a sling.
McCoy: [to Spock] Shut up.
[Kirk opens mouth to comment, McCoy interrupts]
McCoy: Shh. Shh.
[Kirk lays back dejectedly]
McCoy: [smiles] Well, what do you know? I finally got the last word.
Spock: Sarek understands my reason.
Amanda: Well, I don't. It's not human. Oh, that's not a dirty word. You're human, too. Let that part of you come through. You're father's dying.
Spock: Mother, how can you have lived on Vulcan so long, married a Vulcan, raised a son on Vulcan, without understanding what it means to be a Vulcan?
Amanda: Well, if this is what it means, I don't want to know!
Amanda: When you were five years old and came home stiff-lipped, anguished, because the other boys tormented you, saying that you weren't really Vulcan, I watched you knowing that, inside... that the human part of you was crying, and I cried, too. There must be some part of me in you, some part that I still can reach. If being Vulcan is more important to you, then you'll stand there speaking rules and regulations from Starfleet and Vulcan philosophy and... and let your father die, and... then I'll hate you for the rest of my life.
Amanda: Oh, go to him, now, please.
Spock: I cannot.
Captain James T. Kirk: Bones...
McCoy: Are you quite through shaking the ship around?
Captain James T. Kirk: Spock, Sarek, how are they?
McCoy: Well I don't mind telling you, you sure make it difficult for a surgeon trying...
Captain James T. Kirk: [raises voice] Bones!
Captain James T. Kirk: [standing over a dead Tellarite] How was he killed?
McCoy: His neck was broken... by an expert.
Captain James T. Kirk: Explain.
McCoy: Well, from the nature and location of the break, I'd say the killer knew exactly where to apply pressure to snap the neck instantly.
Captain James T. Kirk: Who aboard would have that knowledge?
Spock: Vulcans. On Vulcan the method is called Tal-Shaya. It was considered a merciful form of execution in ancient times.
Thelev: [the Orion ship has just self destructed while everyone watches. Thelev's knees begin to buckle] You see, I had orders to self-destruct, too. Slow poison. Quite painless, actually, but there's no known antidote. I anticipate another 10 minutes of life.
Captain James T. Kirk: Get him to Sick Bay.
Thelev: [Collapses] I seem to have miscalculated.
Gav: There will be payment for your slander, Sarek.
Sarek: Threats are illogical. And payment is usually expensive.
Captain James T. Kirk: I'm sorry about your father.
Spock: Yes, it could adversely affect our mission.
Captain James T. Kirk: Aren't you worried about him?
Spock: Worry is a human emotion, Captain. I accept what has happened.
McCoy: Where do you think you're going?
Spock: I must see the captain.
McCoy: My patients don't walk out in the middle of an operation.
Spock: There is no logic in Thelev's attack upon the captain. There is no logic in Gav's murder.
Shras: Perhaps you should forget logic and devote yourself to motivations of passion or gain. Those are reasons for murder.