There are some things worth dying for. -- Kirk,

Related:

• No one wants war. -- Kirk,
  "Errand of Mercy," stardate 3201.7...
• Kor: "Take this man. Vulcans are members of the Federation,
  he may be a spy." Kirk: "He's no spy!" -- "Errand...
• Aelborne: "Welcome." Kirk: "Reception committee?" Spock,
  "It would seem so." -- "Errand Of Mercy", Stardate...
• I'm a soldier, not a diplomat. I can only tell the truth.
  Kirk, "Errand of Mercy," stardate 3198.9...
• Kirk: "Are you sure you're all right?" Spock: "Perfectly,
  Barona. But it was an interesting experience." -...
• Kirk: "It's a pleasure doing business with you, Mister Spock." -
  "Errand Of Mercy", Stardate 3201...
• Kirk: "Mister Spock, let's you and I pay the Organians a visit." -
  "Errand Of Mercy", Stardate 3198...
• Kirk: "You were right, Mister Spock. A most satisfactory display." -
  "Errand Of Mercy", Stardate 3201...
• The trigger has been pulled. We've got to get there before the hammer falls.
  Kirk, "Errand of Mercy," stardate 3198.4...