"We are the Borg. Lower your shields and surrender your ships. We will add your biological and technological distinctiveness to our own. Your culture will adapt to service us. Resistance is futile." The Borg Star Trek: First Contact
Spock: The ship... out of danger?
Spock: Don't grieve, Admiral. It is logical. The needs of the many outweigh...
Kirk: ...the needs of the few...
Spock: ...Or the one. I never took the Kobayashi Maru test until now. What do you think of my solution?
Spock: I have been and always shall be your friend.
[Holds up his hand in the Vulcan salute]
Spock: Live long and prosper.
[Terrell disobeys Khan's order to kill Kirk, who taunts Khan over the communicator]
Kirk: Khan, you bloodsucker. You're going to have to do your own dirty work now! Do you hear me? Do you?
Khan: Kirk? You're still alive, my old friend?
Kirk: Still, "old friend!" You've managed to kill everyone else, but like a poor marksman, you keep missing the target!
Khan: Perhaps I no longer need to try, Admiral.
[beams the Genesis device away]
Kirk: Khan... Khan, you've got Genesis, but you don't have me. You were going to kill me, Khan. You're going to have to come down here. You're going to have to come down here!
Khan: I've done far worse than kill you, Admiral. I've hurt you. And I wish to go on hurting you. I shall leave you as you left me, as you left her; marooned for all eternity in the center of a dead planet... buried alive! Buried alive...!
Both from Stark Trek 2: Wrath of Khan