In the long history of the world only a few generations have been granted the role of defending freedom in its hour of maximum danger. I do not shrink from this responsibility - I welcome it.
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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Imagination is more important than knowledge. For knowledge is limited, whereas imagination embraces the entire world, stimulating progress, giving birth to evolution.