Related:

• Even historians fail to learn from history -- they repeat the same mistakes.
  -- John Gill, "Patterns of Force," stardate 2534.7....
• Punishment becomes ineffective after a certain point.
  Men become insensitive. -- Eneg, "Patterns of Force," stardate 2534.7....
• Without facts, the decision cannot be made logically.
  You must rely on your human intuition. -- Spock, "Assignment: Earth", stardate unknow...
• The problem with the Nazis wasn't simply that their leaders were the evil, psychotic men they were.
  But the main problem, I think was the leader principle....
• Captain, I'm beginning to understand why you Earthmen enjoy gambling.
  No matter how carefully one computes the odds of success, there is still a certain exhilaration in the risk....
• There's a certain inefficiency in constantly questioning me on things you've already made up your mind about.
  -- Spock, "The Corbomite Maneuver," stardate 1514.0....
• Those who cling to the untrue doctrine that violence never settles anything would be advised to conjure up the ghosts of Napoleon Bonaparte and of the Duke of Wellington and let them debate it.
  The ghost of Hitler could referee, and the jury might well be the Dodo, the Great Auk, and the Passenger Pigeon....
• The Russian dictatorship of the proletariat has made a a farce of the whole Marxist visio
  developing a powerful, privileged ruling class to prepare for a classless society, setting up the most despotic state in history so that the state may wither away, establishing by force a colonial empire to combat imperialism and unify the workers of the world....
• Earth history, remember? Like the passenger pigeon or the buffalo .
  .. once there were millions of them; prairies black with them....