Captain's Log, Stardate 9522.6: I've never trusted Klingons, and I never will. I can never forgive them for the death of my boy. It seems to me our mission to escort the Chancellor of the Klingon High Council to a peace summit is problematic at best. Spock says this could be an historic occasion, and I'd like to believe him. But how on Earth can history get past people like me?
[last lines] Captain's Log, Stardate 9529.1: This is the final cruise of the Starship Enterprise under my command. This ship and her history will shortly become the care of another crew. To them and their posterity will we commit our future. They will continue the voyages we have begun and journey to all the undiscovered countries, boldly going where no man - where no one - has gone before.
[at Kirk and McCoy's trial] Indeed, the record shows that Captain Kirk once held the rank of admiral, and that Admiral Kirk was broken for taking matters into his own hands in defiance of regulations of the law! Do you deny being demoted for these charges?! Don't wait for the translation! Answer me now!
Spock: Good morning. Two months ago, a Federation starship monitored an explosion on the Klingon moon, Praxis. We believed it was caused by overmining and insufficient safety precautions. The moon's decimation means a deadly pollution of their ozone. They will have depleted their supply of oxygen in approximately 50 Earth-years. Due to their enormous military budget, the Klingon economy does not have the resources with which to combat this catastrophe. Last month, at the behest of the Vulcan ambassador, I opened a dialogue with Gorkon, Chancellor of the Klingon High Council. He proposes to commence negotiations at once.
Leonard McCoy: [to Spock, while fixing a photon torpedo to track down Chang's warship] I'd give real money if he'd shut up.
[The Enterprise and Excelsior crews have just averted the assassination of the Federation president]
Azetbur: What's happened? What's the meaning of all of this?
James T. Kirk: It's about the future, Madame Chancellor. Some people think the future means the end of history. Well...We haven't run out of history quite yet. Your father called the future...the undiscovered country. People can be very frightened of change.
Azetbur: You've restored my father's faith.
Kirk: And you've restored my son's.
[The Enterprise crew see Sulu and the Excelsior bridge crew]
James T. Kirk: Captain Sulu! As much to the crew of the Enterprise, I owe you my thanks.
Capt. Hikaru Sulu: Nice to see you in action for one more time, Captain Kirk. Take care. [Excelsior leaves]
Commander Leonard McCoy: By God, that's a big ship.
Montgomery Scott: Not so big as her captain, I think.
Commander Pavel Chekov: So, this is goodbye.
Kirk: I think its about time we got underway ourselves. [sits on captain's chair]
Commander Nyota Uhura: Captain, I have orders from Starfleet Command. We're to put back to Spacedock immediately...to be decommissioned. [long pause as Kirk contemplates the order]
Spock: If I were human, I believe my response would be...go to Hell. [Kirk looks at Spock] If I were human.