Related:

• Change is the essential process of all existence. -- Spock, "Let That Be Your Last Battlefield," stardate 5730.
  2....
• The actual theory is that all life forms evolved from the lower levels to the more advanced stages.
  -- Spock, "Let That Be Your Last Battlefield," stardate 5730.2....
• We are not killers. -- Chekov, "Let That Be Your Last Battlefield," stardate 5730.6.
• No one knows how he'll act under pressure. -- Sulu, "Let That Be Your Last Battlefield," stardate 5730.
  2....
• You're from the planet Earth. There is no persecution on your planet.
  There was persecution on Earth once; I remember reading about it in my history class....
• Spock: "I know of your mind meld with my father, which enabled him to complete his last mission.
  Picard: "It was an honor. He's a great man." Spock...
• Kirk: "Don't crucify yourself, it wasn't your fault.
  Spock: "I was responsible." Kirk: "For no actions but your own....
• Data: "Ambassador Spock, may I ask a personal question?
  Spock: "Please." Data: "As you examine your life, do you find that you have missed your humanity?...
• Without facts, the decision cannot be made logically.
  You must rely on your human intuition. -- Spock, "Assignment: Earth", stardate unknow...