Related:

• In the strict scientific sense we all feed on death -- even vegetarians.
  -- Spock, "Wolf in the Fold," stardate 3615.4....
• Anger is a relative state. -- Spock, "Wolf in the Fold," stardate 3615.4.
• Deriving sustenance from emotion is not unknown in the galaxy.
  And fear is among the strongest and most violent of the emotions....
• Women are more easily and more deeply terrified ...
  generating more sheer horror than the male of the species....
• Jealousy has often been a motive for murder. -- Kirk, "Wolf in the Fold," stardate 3614.9.
• It's life, Jim... but not as we know it. -- Spock
• When a man feels guilty about something -- something too terrible to remember -- he blots it out of his conscious memory.
  -- McCoy, "Wolf in the Fold," stardate 3614.9....
• It would be illogical to kill without reason. -- Spock, "Journey to Babel," stardate 3842.4.
• Kirk: "Don't crucify yourself, it wasn't your fault.
  Spock: "I was responsible." Kirk: "For no actions but your own....