Related:

• Humans smile with so little provocation. -- Spock, "Journey to Babel," stardate 3842.3.
• It would be illogical to kill without reason. -- Spock, "Journey to Babel," stardate 3842.4.
• Vulcans do not approve of violence. -- Spock, "Journey to Babel," stardate 3842.4.
• Worry is a human emotion. -- Spock, "Journey to Babel," stardate 3842.4
• McCoy: "Well, what do you know? I finally got the last word.
  -- "Journey To Babel", Stardate 3842.3....
• It [being a Vulcan] means to adopt a philosophy, a way of life which is logical and beneficial.
  We cannot disregard that philosophy merely for personal gain, no matter how important that gain might be....
• Amanda: "Oh, that's not a dirty word!" -- "Journey To Babel", Stardate 3842.3.
• Andorian Ambassador: "Devote yourself to motivations of passion.
  -- "Journey To Babel", Stardate 3842.3....
• Offense is a human emotion. -- Sarek of Vulcan, "Journey to Babel," stardate 3842.3.