"The greatest enemy of knowledge is not ignorance, it is the illusion of knowledge."

"The greatest discovery of all time is that a person can change his future by merely changing his attitude."

"The world is too complex, too interconnected, for any nation to imagine it can isolate itself and remain unaffected."

"The best way to predict the future is to create it."

"History is not a bedtime story for children, but a warning to the wise."