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Bones: It is a human characteristic to love little animals, especially if they're attractive in some way.
Spock: Doctor, I am well aware of human characteristics. I am frequently inundated by them, but I've trained myself to put up with practically anything.
Bones: Spock, I do not know too much about these little Tribbles yet, but there is one thing that I have discovered.
Spock: What is that, Doctor?
Bones: I like them... Better than I like you.
Amanda: And you, Sarek, would you also say thank you to your son?
Sarek: I don't understand.
Amanda: Well, 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.
Spock: Doctor, I think I'll return to my station now.
McCoy: You ARE at your station, Mr. Spock!
Kirk: Dr. McCoy, I believe you're enjoying all this.
Spock: Indeed, Captain. I've never seen him look so happy.
McCoy: [To Spock] Shut up!
[Kirk opens his mouth to comment, but McCoy interrupts.]
McCoy: Shh! Shh!
[Dejected, Kirk lies back.]
McCoy: [Grinning] Well, what do you know? I finally got the last word.
Spock:Young man, this is likely to be quite hazardous. If I were you...
Kirk: Hold on, Spock. Out of the mouths of babes...
Kid: Who ya callin' a babe?
Kirk: I'm callin' you a babe.
Kid: You callin' me a babe?
Kirk: Yeah, I'm callin'... [Kid brandishes a knife, Kirk continues.] I'm callin' you a babe, but there's nothing personal. Sit down.
McCoy: Spock, I've always suspected that 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: [Amused] A Teddy bear? [Sarek comes and takes Amanda away.] A Teddy bear [to Kirk].
Spock: Not precisely, Doctor. On Vulcan, the Teddy bears are alive...and have six inch fangs.
[Spock is preparing to enter the radiated warp core.]
Dr. McCoy: Are you out of your Vulcan mind? No human can tolerate the radiation that's in there!
Spock: As you are so fond of observing, doctor, I am not human.
Captain Spock: My father says that you have been my friend. You came back for me.
Kirk: You would have done the same for me.
Captain Spock: Why would you do this?
Kirk: Because the needs of the one... Outweigh the needs of the many.
Captain Spock: [begins to remember] I have been and ever shall be your friend.
Kirk: Yes. Yes, Spock.
Captain Spock: The ship... Out of danger?
Kirk: You saved the ship. You saved us all. Don't you remember?
Captain Spock: Jim... Your name is Jim.
Kirk: Mr. Spock, have you accounted for the variable mass of whales and water in your time re-entry program?
Spock: Mr. Scott cannot give me exact figures, Admiral, so... I will make a guess.
Kirk: A guess? You, Spock? That's extraordinary.
Spock: [to Dr. McCoy] I don't think he understands.
McCoy: No, Spock. He means that he feels safer about your guesses than most other people's facts.
Spock: Then you're saying... It is a compliment?
McCoy: It is.
Spock: Ah. Then, I will try to make the best guess I can.
McCoy: Please do.
Spock: Your use of language has altered since our arrival. It is currently laced with, shall we say, more colorful metaphors, "double dumb-ass on you" and so forth.
Kirk: Oh, you mean the profanity?
Kirk: Well that's simply the way they talk here. Nobody pays any attention to you unless you swear every other word.