Kirk: Well, there it is. War. We didn’t want it, but we’ve got it.
Spock: Curious how often you humans manage to obtain that which you do not want.
Star Trek – Season 1: Episode 27 – “Errand of Mercy”
Spock: Curious. What Chief Vanderberg said about the Horta is exactly what the Mother Horta said to me. She found humanoid appearance revolting, but she thought she could get used to it.
McCoy: Oh, she did, did she? Now tell me, did she happen to make any comment about those ears?
Spock: Not specifically, but I did get the distinct impression she found them the most attractive human characteristic of all. I didn’t have the heart to tell her that only I have…
Kirk: She really liked those ears?
Spock: Captain, the Horta is a remarkably intelligent and sensitive creature, with impeccable taste.
Kirk: Because she approved of you?
Spock: Really, Captain, my modesty…
Kirk: Does not bear close examination, Mister Spock. I suspect you’re becoming more and more human all the time.
Spock: Captain, I see no reason to stand here and be insulted.
Star Trek — Season 1: Episode 26 — “The Devil in the Dark”
Scotty: It’s a shame for a good Scotsman to admit it, but I’m not up on Milton.
Kirk: The statement Lucifer made when he fell into the pit. “It is better to rule in hell than serve in heaven.”
Spock: It would be interesting, Captain, to return to that world in a hundred years and to learn what crop has sprung from the seed you planted today.
Kirk: Yes, Mister Spock, it would indeed.
Star Trek – Season 1: Episode 24 – “Space Seed”