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• Tact is the ability to tell a man he has an open mind when he has a hole in his head.
• Concentrate on security.
• Nothing has such power to broaden the mind as the ability to investigate systematically and truly all that comes under thy observation in life.
  -- Marcus Aurelius Antoninus (121-180 AD) -- Meditations, iii, 11...
• There is something you must understand about the Soviet system.
  They have the ability to concentrate all their efforts on a given design, and develop all components simultaneously, but sometimes without proper testing....
• Concentrate on finding your goal, then concentrate on reaching it.
• The superior man is distressed by the limitation of his ability
  he is not distressed by the fact that men do not recognize the ability he has. -- Confuciu...