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 key to performance is elegance, not battalions of special cases.

The beginning is the most important part of the work.

粒子的概念只是近似的，并且只有在动量较小的极限下才有意义。

你必须把失败看作开始和中间，但绝不要把它当作终点。

拥有朋友的唯一方式就是成为别人的朋友。