For time and the world do not stand still. Change is the law of life. And those who look only to the past or the present are certain to miss the future.
As we express our gratitude we must never forget that the highest appreciation is not to utter words but to live by them.
Leadership and learning are indispensable to each other.
Forgive your enemies, but never forget their names.
If anyone is crazy enough to want to kill a president of the United States he can do it. All he must be prepared to do is give his life for the president's.
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Past thinking and methods did not prevent world wars. Future thinking must prevent wars.
For the born traveller, travelling is a besetting vice. Like other vices, it is imperious, demanding its victim’s time, money, energy and the sacrifice of comfort.