Related:

• He's dead, Jim. -- McCoy, "The Devil in the Dark," stardate 3196.1.
• It would be illogical to kill without reason. -- Spock, "Journey to Babel," stardate 3842.4.
• Spock: "She does not know." Chekov: "Then we're dead.
  Spock: "I've been dead before." -- "STVI:TUC", Stardate 9523.8...
• McCoy: "I'm a doctor, not a bricklayer." -- "The Devil In The Dark", Stardate 3196.1.
• No one may kill a man. Not for any purpose. It cannot be condoned.
  -- Kirk, "Spock's Brain," stardate 5431.6....
• Either one of us, by himself, is expendable. Both of us are not.
  -- Kirk, "The Devil in the Dark," stardate 3196.1....
• The people of Vaal] have taken their first step [towards achieving true human stature].
  They've learned to kill. -- Spock, "The Apple," stardate 3715.6...
• You should never bet against anything in science at odds of more than about 10^12 to 1.
  -- Ernest Rutherford...