几何学是独特且永恒的，是上帝心智的反映。
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.
The duty of man is the same in respect to his own nature as in respect to the nature of all other things.
要享受自由，我们必须控制自己。