过去不是一个居住的地方，而是一个学习的地方。
除非你决定如此，否则你不会被困在原地。
It is vain to talk of the interest of the community， without understanding what is the interest of the individual.
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.