Ambassador Sarek: It is difficult to answer when one does not understand the question.
Spock: Humans make illogical decisions.
Amanda: They do indeed.
Ambassador Sarek: As I recall, I opposed your enlistment in Starfleet. It is possible that judgment was incorrect. Your associates are people of good character.
Spock: They are my friends.
Ambassador Sarek: Do you have a message for your mother?
Spock: Yes. Tell her I feel fine.
Spock: To hunt a species to extinction is not logical.
Dr. Gillian Taylor: Whoever said the human race was logical?
Dr. Gillian Taylor: Are you sure you won’t change your mind?
Spock: Is there something wrong with the one I have?
Dr. Gillian Taylor: Don’t tell me, you’re from outer space.
Kirk: No, I’m from Iowa. I only work in outer space.
Kirk: If we play our cards right, we may be able to find out when those whales are being released.
Spock: How will playing cards help?
Klingon Ambassador: Behold the quintessential devil in these matters: James T. Kirk, renegade and terrorist.
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.
Kirk: You’re half human, Spock, don’t you have any god damn feelings about that?
Dr. Gillian Taylor: Do you guys like Italian?
Kirk: I love Italian. And so do you.
McCoy: I don’t know if you’ve got the whole picture, but he’s not exactly working on all thrusters.
Kirk: Oh, him? He’s harmless. Part of the free speech movement at Berkeley in the sixties. I think he did a little too much LDS.
Kirk: This is an extremely primitive and paranoid culture.
McCoy: C’mon Spock, it’s me, McCoy. You really have gone where no man’s gone before. Can’t you tell me what it felt like?
Chekov: I am Pavel Chekov, a commander in Starfleet. United Federation of Planets Service Number 656-5827D.
Scotty: Damage control is easy. Reading Klingon, that’s hard.
Klingon Ambassador: Vulcans are well-known as the intellectual puppets of the Federation.
Ambassador Sarek: Your vessel did destroy USS Grissom, your men did kill Kirk’s son. Do you deny these events?
Klingon Ambassador: We deny nothing. We have the right to preserve our race.
Ambassador Sarek: You have the right to commit murder?