自由的代價是永恒的警惕。
The end of history will be a very sad time. The struggle for recognition, the willingness to risk one's life for a purely abstract goal, the worldwide ideological struggle that called forth daring, courage, imagination, and idealism, will be replaced by economic calculation, the endless solving of technical problems, environmental concerns, and the satisfaction of sophisticated consumer demands.
譯文：富庶之地的百姓，善于經(jīng)商，抓住時機謀利，財富積累到巨萬。
最好的數(shù)學是簡單的，但又不至于過于簡單。