Change is the law of life. And those who look only to the past or the present are certain to miss the future.（改變是人生的法則，而那些只專注在過去和現在的人，注定會錯失未來。）

－John F. Kennedy，Address in the Assembly Hall at the Paulskirche in Frankfurt, June 26 1963.

（資料來源／未來所提供）